Went through the same situation on 90YJ ended up buying new mastercraft seat belts. Tried scuffing off the liner,using washers as spacers, took retractor apart , saw how it worked and still couldn't get the things to work. Good luck.
1990 YJ-258-5sp-3.5BDS-33x12x12.50 BFGMT's-AR136's-AA SYE-CV/DS-WARNxd9000i-in cab control-OlympicBumps-& stinger-Throttle control-Weber551--PosiLock--Aussie locker front& Detroit in rear 4.88 gears, super 35 axles, Bushwacker flares, Bestop seats, mastercraft seatbelts,Tuffy console, Tractor supply tool box -
2003 Rubicon-2"Skyjacker-33x12.50x15 Super Swampers-MT Classic II-Jeeperman bumpers-WarnXD9000i-Brute Force Cold air-