As I remember Tom, 58,59, and 60 Pontiacs also have X frames, 61 went to a swept hip perimeter frame.
However the X frames that Pontiac used, and the X frames that chevy used were not close appearing to each other. I spent a lot of time under both chevys and Pontiacs back in the day, and from memory they were not close in appearance to each other.
The trunk floors could be similar, but I seriously doubt they interchange.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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