Can someone tell me whether this is a 50-cal or 30-cal T&E?
The portion of the T&E that you have is for either the .30 or the .50.
The differance is the "saddle" that sits on the tripod crossbar. Somebody correct me if I'm wrong (and I know you will ) the .30 fits a 5/8" crossbar and the .50 is for a 7/8" crossbar. Good luck on finding a "saddle" on the loose there don't seem to be many around.