Thanks for the replys....yes,I know that small plastic cover is very fragile;a year ago I managed to snap off one of the tabs while replacing the bulb...real plastic surgery!! My post,though,wasn't about the small cover...it was about the larger plastic housing that actually contains the bulb and it's socket. There is a GASKET between it and the rear window...that's what I want to fix...how do I remove or,at least,substantially loosen that larger housing,so I can get to the GASKET?? Again,thanks for any advice!