I can't comment on all this But being "INTO" US Pontiacs as well, I'd say the Catalina is the closest!!! Fenders & doors would likely fit [as they did in past yrs.] the extra lenght came in the 1/4's & trunk area!! Pete

Hmm

As the Bonneville was built on the "B" frame...wouldn't it be the closest?

This is specific to the 1969 models.

The 122" wheelbase Catalina would be closest in terms of dimensions to the Canadian Pontiac. The Canadian Pontiacs were built on a Chevrolet 119" wheelbase chassis and would share the firewall & floor stampings with Chevrolet. The Ventura was simply a trim option available on the Catalina. The Executive & Bonneville series share the longer 125" wheelbase. The Grand Parisienne in Canada really has all the exterior Bonneville trim, but differing slightly in order to work on the shorter 119" wheelbase.

The Grand Parisienne used a Chevrolet Caprice interior, the Parisienne used an Impala interior, the 2+2 used an Impala bucket seat interior, the Laurentian used a Bel Air interior, and the Strato Chief used a Biscayne interior. All used a Pontiac dash & steering column.

It's actually pretty simple.

Pretend you undid all the body mounts and lifted the body off the frame.

What is left on the ground (the rolling chassis and powertrain) is 100% identical to an Impala of the same year.

What is up in the air is an interesting combination of US models and unique Canadian Pontiac pieces. The sheet metal for the most part is unique, however I believe the doors interchange. Bumpers don't, fenders and quarter panels don't, glass does, floor pans don't, a lot of the stuff in the dash does, steering column might with minor modification, (the jury is still out on that one) and so on.

And I'm sure in what I've just listed, someone will correct me!

Carl Stevenson wrote:

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In the closed thread about the 427 Grande Parisienne, Norm had asked this question but nobody had responded when I closed the thread.

I am reposting it here in case someone wants to have a chance to answer it.

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What body style in U.S. production comes closest to matching this Parisienne? I understand the frame and suspension is Chevy but are the body panels the same as the U.S. production Catalina? What is the range of Chevy frames that would interchange with this car's frame? Any idea's on what floor pans or complete floor would interchange?

Thanks, Norm

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the 64 & down frame on US Poncho is NOT interchangeable with any Chevy!!! as Chevrolet used a X frame from 58 to 64 US ones didn't I don't believe 65 & up would cross fit either, as US cars were "WIDE TRAC" !!!  Floor panels on 64 Catalina ,G/P had a
small trans tunnel for the 'roto hydromatic" & won't fit chevy or visa versa Only a few body & interior pcs. will cross over as mentioned above. 64 Heater controls are "TOTALLY" different than the Cdn. Poncho, strg. col. is much "shorter" You have to be really carefull on buying US parts for a "CANUK" poncho!!!