I was using old school slang for reproduction or N.O.R.S. the couple I have played with
the out side diameter does not fit the original bell crank /blockside/ bracket inside diameter
snugly ... originals have just enuf room for grease and thats it ....
you should be able to find a suitable washer diameter and drill the center out a bit,,,
it will then pinch the sleeve...
also put a new quality INSIDE star washer on the head of the bolt... clean the thread hole
of oil and goo with brake clean a couple times because you want to use some blue locktite
on the threads and the block and bolt need to be clean... I have seen a couple of them
walk out of the block before ... make sure the block side washer sits flat on the block too...
the sleeves may fit the aftermarket/repop part better .... I dont know,,,
my cars and the few 68-72's I have worked on all had original gm bellcranks..