Does anybody have an extra passenger side oem mirror cover for a 94 grand marquis? If I can find a good used one I won''t have to buy a new one.

have you checked with any local junk/salvage yards?

an entire new mirror is less than $100 (about $55 is the low price for power mirrors) from what I''ve found on-line.

I''m not sure you can get just the housing. You may be forced to get a whole assembly. again, check with any salvage yards in your area. you might be able to pick one off another car. FYI: 1992-1994 used the same design.