I have not replaced my MB pad, but I did replace one on a BMW a few years back ... used a reflective material that glued on with spray ... very easy. Does NOT look stock, however.
Was about 1/4 the cost of OEM replacement, though.
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg