When talking to an engineer at C5 Fest he told me when they were trying to fit a part from a Corvette onto a Camaro or CTS-V (I don't remember which) they ran into that exact problem.
He asked Corvette why they didn't change the pattern to metric like the rest of GM and was basicly told they were Corvette and have had the same pattern for 60+ years.
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1998 Pontiac Grand Prix - 11.24 @ 121
2009.5 G8 GT (Liquid Red)
GXP fascia conversion, GXP diffuser
2009 GXP M6 (MSM) #405 586rwhp/495tq
TVS2300, CTS-V Fuel System, Cam 222/230 116 lsa, Monster Lever 4 Clutch, American Racing 1 7/8 headers, rear Brembo's w/working Parking brake
11.91 @ 119
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