A set of early seat belts from my ‘70 parts car with a center seat belt set. Floor side buckles are rusty but the belts seem to be in good condition. I’m not sure if the center belts are “rare”. I’ve sold a couple sets, but they are at least uncommon and only came with early cars - which also have factory mounting plates in the floor. $200 + ship for the set.

* I don’t recommend using the center belt for a passenger without a shoulder belt.