Here are some measurements : Retainer . Says use with R 1584 FE . Bower RNF 1584 Outside Diameter 2.5 inches Shaft Diameter 1.780 inches Thickness .750 inches Bearing : Hard to read : TIMKEN U499 Made in U.S.A. Outside Overall Diameter 3.110 inches Inner Shaft Diameter 1.750 inches Thickness 1.025 inches Roller Diameter 2.930 inches Hope this helps a bit . Measurements could be + or - a bit . I did my best . I know these came from my 70 Estate Wagon years ago and I remember what a pain in the ass till I got the correct replacement . That's when I learned it was listed as a Cadillac Commercial Chassis Rear . I was cleaning out the garage and came across it yesterday .