For starters, all the frame,suspension and brakes are differant as noted, Pontiac used 122" or 124" wheelbase, the Chevy/ Canadian Pontiac use a 115"WB. 5x5 wheel bolt pattern for Pontiac, 4 3/4 for Chevy/Canadian. At least with the Chevy frame/suspension you can buy any aftermarket brake /suspension upgrade available.
I would think the moulding at least for the rear would be shorter because of the shorter wheelbase? The doors / trim are the same as well as the glass.
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