Your Golden Eagle didn't have odd rotors. The V8 Cj's had 11" rotors whereas the others had 10". Any parts store should have shown the rotors.
FYI...the TH400 robs about 15% of your horsepower just to operate. It will be very noticeable unless you are running a V8. Also you would think these things would be worth some money, but not really. I held on to two of them for years and ended up giving them away about 6 mos ago. I am running a Chvy Th400 currently, but it resides behind a Chvy 5.3.