There are two sizes of UJ and sounds like you may have the wrong size fitted - do you still have the old ones you took off to measure from ?
Just changed my V8 110 rear uj's at the weekend and they are quite a bit larger than my 200 tdi 90's
110 is an '86 so quite old - maybe the same for your 90 since it is '85, although as far as I was aware it was only V8's that were different (although I may of just dreamt that last bit !)