hmm. I thought it was 1 3/16th. I guess i'm missunderstanding. Also, I spoke with richmond and they told me all the factory 4 speed stuff would work, so I assumed the hydraulic bearing would have the same measurement the standard one does.
I'll have to check and see what i've got. I actually have a non-hydraulic throwout that came with the tranny, so maybe that'll give me a btter idea.
Mcleod's catalog isn't working, and summit doesn't have adequate descriptions, so I can't locate the bearing i need. I'll have to make some phone calls.