I think the part that you're talking about is the headlight door. The amber light thats busted shouldn't be too hard to replace becuase you should be able to find a sealed beam replacement for that. First I would check ebay for these parts you can also check fastlane though.

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W126 1983 300SD 286,000 miles and ticking
Baby blue exterior Grey MB tex
Recent work:
Replaced air cleaner mounting brackets and heat shields
Replaced alternator, fan and power steering belts
Replaced positive battery terminal
Replaced negative battery terminal and cord
New Duralast Battery

My car needs work.