I cant figure out which model you have. Your post doesnt have it, nor does your signature. It just talks about fords =). I like my dads new F350 extended mirrors those are really nice for fords.

On your mercedes I think you might have trouble getting the wires for the lights into the cabin through the mirror holder. If you search some posts about W123 coupe mirrors someone describes how to get them off. Try that. Then read what I said about blind spots in the same thread. (use side mirros for bind spots and not looking backwards)

ML mirrors are pretty cheap, they already have turn signals in them, why dont you try to mount those on your car.

Austin

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.