I hope this is the right forum…
I am looking for seat belts for an '89 Lincoln Town Car. What other makes, models, and years used the same one? Where can I find this info?
Junkyards have interchangability books.
The manual/software is called a Hollander manual.
You may find that auto parts recyclers in your area do not sell seatbelts. Even if you can find one that does sell used seatbelts, obviously you do not want to buy used seatbelts.
It’s possible that other fullsize Fords (i.e., Crown Vic and Grand Marquis) or Continentals of the same vintage use the same belts. YMMV