904 slip yoke seal

Why the hell cant I find a slip yoke seal to fit my 904??? The one that came in my rebuild kit was too big, the one I ordered from R A was too big, and the one I just picked up from NAPA was also too big! The recess in the tailshaft measures 2.260" and the replacemtent seals im getting are 2.37something. Do I have some oddball bastard tailshaft? This is literally the only thing keeping me from having this trans ready to go and im about to lose my s*** over it.