what's the part number for the left xenon headlight lens on a '99 C43? (and also the rubber gasket, if that's a separate part#)

(left = pasenger side)

The reason I want to replace it is because the lens is somewhat
foggy(when compared to the right side). I did take out the
lens and cleaned the inside, but that did not help.

Should I also replace the right side lens? (since the new left
lens will probably make the old right lens look foggy afterwards)
(if so, I'd also appreciate the part# for the right side)

THANKS!!!