Other than the different divisions used different cooling fin designs, I believe that tons of GM cars used 9.5, 5 X 4.75 bolt circle drums than interchanged. 10 and 12 bolt should make zero difference.
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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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