I am doing the same on my 230SL. Couple of questions: what are putting below the mats? AFAIK, they sat on some type of padding / insulation, but I can't find any specifics on it. Also, did you just wind laying your new mats over the old ones to trim the driver's side correctly (ie, dimmer hole etc.)? Would love it if you would show some final pictures when done for those of us that are installing them. Many thanks! Lowell