Ill have a look at it when the car gets back from the paintshop at weekend , but if its anything like other German cars of the same era it will be an assembly of two as tic halves riveted together .
The rivets corrode and the seal is lost ...
It is an easy job to remove it and drill out the rivets , clean it , then reseal using nuts and bolts .
Iirc you will drill 6mm and use 5mm bolts to "re-clamp".
Lots of guys in non-smog states remove it all together ...
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