i just got lorinser rs6 18" wheels for my 02 clk 430 the fronts are 18x8 38 offset and the rears are 18x10 38 offset need help on what tire sizes ill need or if ill need spacers....please help

 

you can use the 225 40 18 in the front and either 255 35 18 or 265 35 18 in the rear.

judging by the offsets you provided, they should bolt right on.....they might not be flush, but nothing a 5 or 10mm spacer can't fix =)