Front Outer Seats for a Front bench seat on a 70 Duster

I have the outer but I don't know which is left or right retractable seat belts for my 70 Bench seat Duster. The number on one is 445685 and on the flip side is T1-87 those numbers are on chrome end that . The other one has the number P-535 and that is the only number on it. I wish they had an"L" and a "R" stamped on them for old people like me!!!