Wow, I did a quick peek at parts listed for that beast and see your problem. Are the calipers one-piston or two-piston? What is the rotor diameter; 302mm, 305mm, 328mm, or 330mm? The 302/305 and 328/330 being so close to each other, you need to measure rotor diameter very carefully.
Are you taking the actual parts, a rotor and caliper, in to a NAPA store? They should be able to measure the rotor, or easily match it to one on-hand. If they have not seen one of your calipers, are ust going by parts listings, then I still must question how many pistons on the caliper