If the gasket came off very very good, just use some light lube and put it together. if they are a little torn, I would use some clear silicone sealant. Use a THIN coat.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM