You should try a different dealship for sure, just walk-in dont call...ask to see the schematics. You can buy each individual nut/bolt on the car. Goto the dealship explain where the part is located the parts tech will pull up a schematic of the entire sunroof area and then you can tell him which nut you want.

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM