It's the caliper itself not the insert on the bracket. The caliper only accepts a .81 rotor that is not available for this rear end. I would and will order parts from Dave any day of the week. He is extremely helpful and knowledgeable.
I got the caliper number from Dave, at the time He did not have in stock and was going out of town. I ordered the calipers and am stuck with them. Just when you order confirm minimum and maximum rotor thickness with Wilwood by caliper part number.
Be careful. I ordered the part number He gave me because He was out of red at the time from another vendor. Long story short they don't fit. They only except .81 thick rotor and the trans am rear you can only get. 9
I went through 4 sets of mufflers then finally spent the money I should of in the beginning. Pypes set up quite inside loud out the back. Muffler between rear end and gas tank with x-pipe and true dual. The single muffler has two mufflers wrapped into on can. Great sound and ground clearance.