Shown above are the two different brackets. The bracket for the 11-inch rotor is on the left, with 3 3/8 inches to the hole centers. The 11.75-inch bracket has 3.75 inches to the hole centers. The A and B spindles both use the same axle stub and caliper bracket mounts, so it's possible to use the A/E-Body rotors and calipers, as long as you use the shorter caliper bracket. Although all of these rotors have the bigger bolt circle, you can at least keep 14-inch wheels by using the 11-inch rotors. If you can use 15-inch wheels, step up to the 11.75-inch rotor for better stopping power.