Going off my comparison of rotors for a 2003 Grand Prix and a 2004 Grand Prix on NAPA's website, it appears that I was correct in that 04+ cars have 12" front stock and 97-03 cars have 11" front stock (or 11.69" & 10.94" respectively -- whatever). However, bballa mentioned Monte Carlo rotors, so I checked into the stockers for a 2002 Monte Carlo, and they're listed at 11.94", which has me going. Also, the rear stockers for the 2003 Grand Prix and the 2002 Monte Carlo are both 10.94", but the rear stockers for 04+ Grand Prix' are 10.63"? This all just seems a little ridiculous to me. Please don't tell me that each variance in 10.x" and 11.x" has its own mounting bracket as well, because that would just be d*mn silly.