Looking at the data card, you need the regular switch, not the memory one. Regular one looks the same but doesn't have the 1 and 2 buttons.
There is one complication, early W126's didn't have pluggable switches, they were hard wired. I can't remember if 82 is in that category, but I can check in my 126 book. I think the recommended fix is to splice in the plugs, but you could just do it wire by wire.