I am thinking of buying some 20" rims from a local seller and here are the specs on his rims:
front 245 35 20
back 275 55 20
staggered

I have a 04 e320 and if anyone has any suggestions on what this will do to my ride or if they will fit etc, please i'm open to here your expertise.

Spec on the wheels would help. The width and offset? Im not sure about the rear tires, 55 series or u mean 35 series? Neither way, the rear tires gotta be atleast 30 series especially on 20" wheels.