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Those aren't resistors but rectifier diodes. The 3rd small box is a small low power relay. Looks like the purpose is to cut power to the main relay coils when the sunroof hits end of travel so you don't accidentally burn up the motor. I'm surprised it needed a protection circuit like that as I don't think power window motors are protected like that. Only part # I could find for sunroof relay is 20652833. Can't find any photos of it, so I don't know if that was the right one.

So, the stop switch doesn’t function, but I can way more live with that, everything else functions perfectly.

Apparently It’s called a spring plate. If I’m seeing things correctly, it seems like it’s used to attach to lower part of a spring compressor.