Set of four pieces which is enough for one car as two are used at each end of the clutch cross shaft.  Some times they fall out and are missing!  Used on Mopars back to the begining of time. Mid 1930's.  O/D is 15/16"  

They grip around the round ball stud pivots.

These might be the only ones that arn't plastic on this planet.  Old stock.  US Made in New York.