Apparently internet forums are not the only places to find disagreements on this subject. I went to rockauto and looked up rotors for both the Trans Am and the Grand Prix and looked at the drawings provided by Centric for the rotors on both of these cars. They match every spec except outer diameter. However, they show both rotors having a 5 x 4.65" bolt pattern which would be about 5 x 118mm. Maybe your idea about the holes being a little larger to accomodate two different sizes is dead on? Anybody have first hand experience trying to fit F-body rotors onto a GP?
