Hi,
You could look in a yard and find a complete sunroof assembly with the linkage. I did this and had spare parts left over in case of a future failure. The dealer will charge you about 150.00 for the one side that is broken, it comes as a complete assembly. Good luck.

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1991 190E 2.3 SOLD
1972 911t 2.4 owned since 4/80 300,000+ miles SOLD
1999 C43
Merlin XLM, All Ti, 17.5lbs.