Translated from German, they are called Stroke Brackets and mount on either side of the sliding roof at the rear. They are for adjustment of the rear height of the roof, which should be 1mm higher than the roof of the car. The front should be 1mm lower than the roof of the car. This is for noise avoidance.

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Don't Chrome them; polish them

Thank you. I should be able to figure them out, now.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags