You have to pull the center two vents out and then the screws pointing downward. This will give room. Now pull the wood off of the swich area. You will then see the two retaining screws.
We sell them OE.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM