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Here is a set of black seat belts for a 72 bucket seat car plus some extras. Some work required but should make a nice set of hard to find belts when finished.
Back seat lap belts (one retractor seams stuck):
Front lap belts - New reproduction retractor covers. One or both long belts will need shortened and re-sewn at the floor mount. The short one is the correct length. The other short belt is included (see last pic), but mice chewed just about the whole way through it:
Front shoulder belts including the plastic roof holders:
Extra belts and parts including the mouse-eaten front lap belt: