JY said that regulator from several years will fit the door. Motor must match the regulator. I'd pull the whole thing & lube the tracks so the regulator doesn't get bent (and ruined). Regulator and motor $100 from the highest price yard around here but they pull the part.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.