seat belts with retractors- black

I have both left and right side seat belt retractors and lap belts from I believe a 1973 Duster we had a year or so ago. the part #'s on the retractors are:
left side-3508287
right side-3508286
the tag on the one belt is the same as the right side retractor, 3508286 and the tag is missing on the other belt. The retractors work fine. This car had a bench seat in it and they look the same as the belts in the 73 dart Sport we have. Pics of the tags didn't come out so good. located in zip 41035. $50.00 plus ride for the set.