5 Mustang Sampling Cadillac 6 Team Penske Acura 7 Team Penske Acura 10 WTR Konica Minolta Cadillac 31 AE Whelen Engineering Cadillac 55 Mazda Team Joest 77 Mazda Team Joest 85 JDC-Miller Cadillac Photos by Brian Cleary 19