I ran into a problem when I bough the clutch kit for my 2.5. I originally had a 91 2wd Internal slave AX-4. The transmission I was putting in came out of an 86 XJ, so I was able to convert to an external slave.
My clutch was slipping at that point, so I bought a new clutch for it as well. The first kit they gave me had the wrong throwout bearing. It was an external throwout bearing, but it was for the wrong fork type. We tried the kits for the 91 and 86, but both had the wrong bearing.
I ended up ordering the kit for an 86 XJ with a 2.8, and it came with the correct parts.
The bearing you need is for this style of external slave:
The one I got the first time was for this style, which never came with the AX-4/5: