Yes ago I picked an 82 tub and frame for next to northing. Prior to that purchase bought parts off it. One was the center console. Lid for the ashtray was gone. At that time the ashtray was still available available and picked one up. Same ashtray was also used in a Celica.
Not sure the wiring of the 81 rear heater but those the blank next to it was a heater switch for the blower. The FJ60 rear heater switch on the dash are the same as the 81 FJ40. Not sure if it was used to cycle it off when the front higher is on high or run it independently of the front heater.
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Have a pair of late model hard top sides (2/78 or newer). Believe no newer than 7/80. I see yours has a square box in the back corner.
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Only use I see it being used for is the LX rear forward facing seat's three point seat belt. I wonder if the US didn't require a roll bar if we would have if LX would have been imported.
Did your 82's room light survive and still there? I got lucky and scored one cheap years ago.