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The only experience I've had with this situation was 23 years ago when I first had the notion of mounting the crosslace wheels to the car. At that time I didn't realize that the 16x7 crosslace wheel fitted to the Bonneville's were not quite the same as the crosslace wheels fitted to the GP's. After unknowingly picking up a set & going to the effort of refinishing them when it came time to mount them that's when I discovered that Bonneville wheels (H platform) won't fit the W platform (by that I mean they won't clear the calipers). I should've been more diligent in my research...... finding out that the H platform wheels share the same dimensions as the 2nd gen W wheels.

I have `99 GTP rims on my `94 Cutlass. I had to use 1/4" spacers to clear the front calipers but IIRC the rears were fine. If our cars are measuring 115mm I recall reading years ago there was a desirable Mustang rim in 113.5mm that was close enough to work. I never mounted them to see for myself though.

? the bolt circle is 115mm, Gen 1 & 2 are the same circle, one CAN get Gen 2 wheels to bolt to the Gen 1 suspension but one needs (ugh) a minimum 1" spacers to allow the needed clearance for the calipers.