Clutch Throwout Bearing for 10-B

I need a clutch throwout bearing for my Franklin10-B. The clutch was made by Borg and Beck. According to the Franklin parts book, this is Franklin drawing no. 26707. The throwout bearing that was in the clutch has an outside diameter smaller than the specified part and does not fully engage with the fork. A used part in good condition would be fine. A modern replacement would also be fine if it has the proper dimensions according to the parts drawing.