74 Seatbelt Bolts

I wouldn't know how to classify them until now.
I looked at what I have in the 74 which are C10, and I have C10 in my 70, both of which work thread wise, but all the shanks on them seem long which may be OK where the belts are doubled up for 3 passengers on a bench seat. I'm wondering if there are shorter shank bolts for "single" belt bolts, for bucket seats and shoulder belts as the longer shank bolts let them "flop around", not too mention won't allow the plastic covers that conceal them to lay flat which doesn't appear right to me.