These GM build sheet numbers decode as follows:

AG7 6 way Power Seat
AK1 Custom Deluxe Seat Belts
AL5 Deluxe Rear Center Seat Belt '67.
AN7 Strato-Bucket Seats, Swing out!
Al3 Power Door Locks
Al6 Power Tailgate Release
AO1 Soft Ray Tinted Glass, all windows.
AO2 Tinted Glass, windshield only.
AQ2 Electric Seat Back Lock Release, '71
AQ5 Electric Seat Back Lock Release, '70
AS1 Shoulder Harness, '67+
AS4 Deluxe Rear Seat Shoulder Harness, '68+
AS5 Standar Rear Seat Shoulder Harness, '68+
AT8 Reclining Passenger Seat
AU1 Electric Door Locks, '70+
AU3 Power Door Locks
AV3 3 Point Seat Belts (from 1972 Build sheet)
A20 Custom seat belts, '64
A20 Swing Out rear windows, Laguna
A31 Power Windows
A33 Power Tailgate Window
A39 Custom Deluxe front and rear Seat Belts, 66+
A37 Seat Belt Equipment, '64 only.
A41 Power Front Seat, 4-way
A42 Power Seat, 6 way
A41 Power Bucket Seat, 4 way.
A46 Power Drivers Bucket Seat, 66+
A47 Custom Deluxe Seat Belts.
A49 Custom Deluxe Seat Belts, w/retractors
A51 Front Bucket Seats, Astro
A52 Front Bench Seat
A62 Seat Belt Delete
A64 Custom Deluxe Rear Seat Belts, '65.
A65 Split Front Seat w/arm Rest
A66 Split Second Seat
A68 Standard Rear Center Seat Belt. '67.
A81 Head Rest, Bucket Seats
A82 Head Rest, Bench Seat
A85 Deluxe Shoulder Harness, '66 1/2 +
A90 Electric Trunk Opener
A93 Vacuum Door Locks, '69



BO1 Police Body Equipment, '64-65.
BO2 Taxi!! '64-65.
BW2 Deluxe Body Side Molding
BX4 Body Side Molding
BX8 Full Body moldings
BW1 Delete tailgate ornamentation.
B2H Interim Equipment Change
B2M No power steering.
B22 Door trim pad emblem " SS "
B37 Colored floor mats
B44 Removable Load floor carpet
B55 Deluxe Front Seat Cushion, '67+
B70 Padded Dash '64-65.
B75 lining lug compartment, '69
B80 Roof Drip molding
B81 *Delete tailgate molding. This would delete the horizontal trim strips on the tailgate of a '70-'72 El Camino or GMC Sprint.
B84 Body Side Molding
B85 Beltline Reveal Molding
B90 Door Window frame moldings
B93 Door edge guards
B94 "GMC" tailgate emblem ('71-'72 GMC Sprint only).
B95 Rear end panel moulding, '69
B96 Wheel well moldings
CA1 Power Roof
CB1 Vinyl Roof, Touring
CB7 Vinyl Roof cover.
CD2 Windshield Washer Level Control, '70+
CD3 Electro-tip Wipers, '70+
CE1 Headlight Washers
CO5 Convertible Top, Manual.
CO6 Convertible Top, Power
CO8 Vinyl Roof, full
CO9 Padded Vinyl roof
C14 Two Speed Wipers, '64.
C24 Special Windshield Wipers
C47 Auxilliary Underseat Heater (n/a with buckets, floor shift or power seat) 
C48 Heater Delete
C49 Electro Clear defogger
C50 Rear window defogger
C51 rear window air deflector
C56 = I/P side vent /70 Upper Level Vent / Astro Ventilation
C60 Air Conditioning, 4 seasons.
C65 Air Conditioning, Deluxe version.



D24 Litter container
D33 Remote Control mirror
D34 Vanity visor mirror
D35 Sports mirrors
D55 Console
D64 Illuminated Visor Mirror
D68 Twin Remote Sport Mirrors
D80 Spoilers
D88 Sport Stripe, '70+
D91 Conquista package
D96 Wide Paint Stripes, * '67+ refer's to body side accent stripe
D99 Two Tone Paint Moldings
FE8 Radial Tuned Suspension
F40 Sport suspension
F41 Sport Front and Rear Suspension, '69+
GS1 2.73 Ratio Axle (from 1972 Build Sheet)
GY2 *3.31 ratio axle ('71-'72 Chevelle / El Camino / GMC Sprint).
G11 2.56 Rear Axle
G66 Air Shocks, rear.
G67 Controller for Air Shocks.
G75 3.70 rear
G76 3.36 rear axle ratio
G80 Positraction rear
G82 4.56 Rear axle
G84 4.10 Rear axle
G92 Performance rear 3.08
G94 3.31 rear
G95 Economy rear 2.73
G96 3.55 rear
G97 2.73 Rear ratio
GW5 273 Ratio Axle
HO1 3.07 rear
HO5 3.73 rear axle ratio
J50 Power brakes
J52 Front Disc Brakes, '67+
J65 Metallic Brake linings
JL2 Front Disc Brakes, '70+
JL8 ('69 only) 4-wheel disc brakes



KD5 Heavy Duty PCV System
KO2 Clutch Fan
KO5 Engine Block Heater
K19 AIR , smog pump, '66+
K24 Closed Engine Ventilation, PCV.
K30 Cruise Control
K66 Transistor Ignition.
K72 Emission Control Delete
K75 Emission Control Delete
K76 61 amp alternator
K77 55 amp alternator
K79 42 amp
K81 62 amp
K85 63 amp
L14* Refers to: = 307 CID STD V8 (from 72 Chevelle)
L22 Six Cylinder 250
L26 230-140hp
L30 327-275 Hp
L34 396-350 Hp
L35 396-325 Hp
L48 350-300hp, '69+
L61 230 cid
L65 350-250hp, '69+
L72 427-425hp Yenko, '69
L73 327-250hp, '68
L74 327 300hp
L77 4 barrel carb, 283-220 hp
L78 396-375 Hp
L79 327-350 Hp
L89 396-375hp, Aluminum Heads
LF6 400-255hp 2 bbl, '70 (Monte Carlo)
LM1 350-255hp, '69
LS3 400-330hp, '70+
LS4 454-235hp
LS3 402-300hp in'71...240hp in '72
LS5 454-365hp in '71...270hp in '72 - LS5 (also 360 HP in '70).
LS6 454-450hp, '70
LT4 400-180hp
L65 350-145 2 barrel
L90 Six cylinder
MO1 Heavy Duty Clutch
MC1 Heavy Duty 3 spd Transmission
M10 Overdrive
M11 Floor Shift Transmission, '71+
M13 Heavy Duty Transmission
M20 4 spd standard transmission.
M21 4 spd close ratio
M22 4 spd, Heavy Duty
M35 Powerglide automatic, 2 speed.
M38 Turbo 350 automatic
M40 Turbo 400 automatic
M55 Transmission Cooler



NA9 Evaporative Emission Controls
NB2 Refers to:: EXH EMISSION (from 72)
NC8 Chambered Exhaust System
NK1 Cushioned Steering Wheel
NK2 Custom Steering Wheel, '71+
NK4 Sport Steering Wheel, '71+
N10 Dual Exhaust
N30 Deluxe Steering Wheel, '67+
N31 Custom Steering wheel
N33 Tilt steering
N34 Wood grained steering wheel
N40 Power Steering
N41 Power steering
N65 Space saving spare
N95 Wire Wheel covers
N96 Simulated Magn. Hubcaps



P19 Spare tire lock
P58 7.14.4 Whitewalls
P61 7.75-14 W/W
P62 7.75-14.4 W/W
P67 6.95-14 w/w
P77 8.25-14 w/w
P90 G70-15 White Stripe
P91 G70-15 Red Stripe
PA2 Simulated Wire Wheels, 2nd style, '68+
PA3 Deluxe Wheel covers
PE1 Turbine 1 wheels
PE2 Turbine 2 wheels
PK2 G78-14 w/w
PK4 G70-14 Red Stripe
PL3 E78-14 White Stripe
PL4 F70-14 F70-14 White Stripe
PL5 F70-14 White Letters
PM6 G78-14 White Stripe
PM7 F60-15 White letters, SS models. (also Sprint SP models).
PN5 7.75-14 8 ply tires
PO1 Wheel Trim Cover
PO2 Simulated Wire Wheels, 14"
PO6 Wheel Trim Rings
PQ7 8.25-14 w/w tires
PR3 8.25-14 8 ply w/w
PU8 G78-15 White Stripe
PL2 E78X14 B/WALL
PW7 F70-14 White Stripe
PW8 F70-14 Red Stripe Tires
PX5 F78X14 Black Wall Belted (70)
PX6 F78-14 w/w
PX8 G70-14 w/w
PX9 G70-14 Dual White Stripes
PY4 F70-14 w/w
PY5 F70-14 Red Stripe
PY7 G70-14 Red Stripe
QDR GR78-15 radial whitewalls
QEH E78-14 bias White Stripe
QEL HR78-15 Radial white stripe
QGF G70-14 Bias White stripe
QGK G78-14
QGL G78-14 bias white stripe
QHE H78-14 Bias
QHF H78-14 Bias white stripe
QQZ HR70-15 radial whitewall
QRM GR70-15 radial whitewall
QRN GR70-15 Radials
QRV HR70-15 Radials
QRZ GR70-15 Radial White Letter
TO7 7.75-14 W/W tires
T15 7.75-15 8 Ply tires
T58 Rear wheel skirts, wow. (Monte Carlo)
T60 Heavy Duty Battery



UA1 Heavy Duty Battery
UM1 AM radio with tape, '70+
UM2 AM/FM with tape
UO3 Low note horn, D.
UO5 Dual horns
UF1= Mirror Lamp (available in '70-'72).
UF7 Econominder Gauge package
U14 Instrumentation package
U15 Speed Warning Indicator, '67+
U16 Tachometer
U17 Cluster INST (Oil coolent,AMM, Clock, Gas, Tach)
U18 Export Speedometer
U25 Trunk Light
U26 Underhood Light
U27 Glove box Light
U28 Ash Tray Light
U29 Instrument Panel Courtesy Lighting
U35 Clock
U46 Lamp Monitoring Equipment
U57 8 Track Tape Player
U58 AM/FM
U60 Manual radio
U63 Basic old AM radio
U69 AM/FM radio with buttons.
U73 Manual Rear Antenna
U75 Power Rear Antenna
U76 Antenna in windshield
U79 Stereo Equipment
U80 Rear Speaker

VE5 Deluxe bumper strips
VO1 Heavy Duty Radiator
VO2 Heavy Duty Radiator, '64
V30 Bumper Guards. Full set. -Front only bumper guards on El Camino / GMC Sprint. (El Camino / GMC Sprint never came with rear bumper guards).
V31 Front Bumper Guards, '64-70
V32 Rear Bumper Guards, '64-70
V55 Roof Rack
V74 Hazard Warning Equipment, '66.
V75 Traction Dispenser set-up.

W84 Additional fuel for delivery

X11 Style Trim for base car or SS
X22 Style Trim for SS with 396
X33 Style Trim for Z/28 or RS with Z/28 option
X44 Base Car
X55 Base SS with 350
X66 Base SS with 396
X77 '69 Z-28 camaro Norwood OH cars only

YB5 General Processing Option (beats me?)
YD1 Trailoring Axle
YE7 *Special Performance "SP" package ('71-'72 GMC Sprint). .
YF3 The Heavy Chevy Package
YF5 Emission Tested
YJ9 Exterior dress 'emup package



Z10 has something to do with a special hardtop pace car
Z11 ('69 only) Indy pace car accents
Z21 Style trim group
Z22 Rally Sport
Z23 Special interior package
Z27 SS equipment
Z28 Special performance package
Z87 Custom Interior group
ZO1 Comfort and Convenience Group, '64-65.
ZO2 Pushbutton Radio and extra speaker, '64.
ZO4 Heavy Duty Chassis, '64-65.
ZO8 Body Molding/Trim
ZJ7 Ralley Wheels
ZJ9 Auxiliary lighting group
ZJ6 Special Sport Sedan, '68+
ZJ7 Steering Wheel Deluxe Trim
ZJ9 Auxiliary Lighting Group
ZK3 Deluxe Seat Belts, and Front Shoulder Harness, '68+
ZK5 Concours Sedan, '68
ZK6, 7 Concours Sport Coupe, '68
ZK8 - Refers toTire Pressure Label, '70
ZKQ - tire pressure sticker
ZL2 Special Hood, Cowl Induction, '70+
ZL3 SS 396 CONVER--
ZO9 Performance Rear Axle, '70+
Z10 Pace car coupe
Z11 Indy pace car convertible
ZP2 *Trim & color override. This was for cars that had an exterior/interior color or trim combination that was not normally available. This code is listed on the build sheet for a '71 GMC Sprint that was "Classic Copper" with a "Dark Saddle" interior - a color combination not normally available.
ZR3 Refers to: = Off road package 454(LS7 & LT2) 69*
Z02 refers to: **SPEC PAINT** (from 72 tag)
ZP5 *Appearance guard group.
ZW4 *Std Trans 3spd (70)
Z13 Comfort and Convenience Group, second style, '64-65.
Z14* Refers to: = A/C BODY CONV (info from 72 Chevelle)
Z15 SS equipment. (454 in '70)
Z16 Special Sport Coupe - 65 Chevelle
Z19 Convenience Group, '66.
Z20 Monte Carlo SS 454
Z25 Super Sport Option, '69+
Z29 Vinyl Stripe
Z49 Canadian Base Equipment
Z57 Vinyl Coated Trim
Z83 Road Hazard Package, '66.
Z95 Regular Fuel Engine Equipment
Z46 Cold Cranking Equipment (HD Battery, HD Delcotron, HD Battery Cables, Ultra-High Starter) 1967-68 only

ZE2 1976 Olympic Package (for Malibu & Malibu Classic Coupes, Lemans Sport Coupe)