Mark, if you haven't done already, just call your local dealer and give them the numbers? That would be the easiest to do and go from there... I'm sure there must be repops out there... Did you type the p/n on an ebay search... That to i'ved done before with great results! 

One of these days I will have to add position #3 rubbers to my Rag... Forgot and never thought about it since I replaced the frame with a 4-dr one back in '88ish... Oh well, no ill effects to date.. (lol)

I just changed the rears on a 66    

Original re-pros seem to squish down  (according to Uncle Bernie who replaced his in Lemans )  

I bought a kit and used 2    

your welcome to 2 or more if you like.....

just saying  

read the B-Body sites     re-pros are not recommended    (as they are not made to OE 66-67 specs)

They are a perfect fit in the back of my 1966 B-Body      I'd rather have a black poly working well   than a re-pro all squished down  (2 cents)

I bought a set of offshore mounts. I should have talked to NOS, but at first glance everything looks good.

But the one thing that makes me suspicious believe it or not, is the smell of the rubber. Yea, the smell! I'm sure most here know what I mean. you know that cheap, princess auto rubber item smell? Yea, these are just like that!

We'll see. I'll just do the rearmost and see how that goes. 

Molded SRB rubber

I will do that for you    

I was just going over them, to replace the rad supports....    

I have them all except the rears  (installed)

"Aluminum body mounts are too harsh for street use and tend to break, causing damage to other parts.

Original rubber mounts are so soft that they crack, distort, crush, and often fall off.

Energy Suspension's specially formulated polyurethane body mount sets combine the best qualities of both--they're soft enough for a smooth ride, and yet rugged enough for the most demanding road or track.

Most have a steel ring molded into the end for added durability."     

For many purposes SBR directly replaces natural rubber, the choice depending simply on economics.

Its particular advantages include "excellent" abrasion resistance, crack resistance, and generally better aging characteristics.

Like natural rubber, SBR is swollen and weakened by hydrocarbon oils and is degraded over time by atmospheric oxygen and ozone.

In SBR, however, the main effect of oxidation is increased interlinking of the polymer chains, so, unlike natural rubber, it tends to harden with age instead of softening.

The most important limitations of SBR are poor strength without reinforcement by fillers such as carbon black (although with carbon black it is quite strong and abrasion-resistant), low resilience, low tear strength (particularly at high temperatures), and poor tack (i.e., it is not tacky or sticky to the touch).

These characteristics determine the use of the rubber in tire treads; essentially, its proportions decrease as the need for heat resistance increases until 100 percent natural rubber is reached in the heaviest and most severe uses, such as tires for buses and aircraft.

sr-71 wrote:

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I'm new this forum but if anyone is interested I have some NOS GM mounts that have been in cool dry storage for the last 30+ years. Part number on them is 3926945. I bought them for a GTO restoration in the 80s and were incorrect for the application.

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Welcome to the site!  Here you can see applications for those body mounts # 3926945.