[Bigger is Better]

OK, so I found some of my original information. The kit I bought was Wilwwod 140-6293S (staggered shock), 2.75 inch offest. As I mentioned this kit was a special Wilwood kit for HOTRODUSA but it was basically the 12 bolt internal brake kit for 2.75 inch offset but with a two piece hat/rotor as compared to the standard Wilwood kit.

The issue I ran into was the pilot on the diff was 2.84 inches and the brake kit had a relief for a 2.725 inch pilot. If you look at the Wilwood flange diagram it lists the pilot OD that I have as a "12 bolt late" and not the standard 12 bolt. At the time I measured two 1980 4 wheel disc 10 bolt TA diffs so I am not sure if those were unique, I didnt think so. The top bolts are also around 3.072 inches center to center (??).

Thats all from a trail of emails I had so I cant garuntee its accuracy. I recommend that you measure the offset of your axles but also the register OD. From there you should be able to talk to Wilwood about a matching kit, it might be for the "12 bolt late" application.