I have never tried it, but I have been told by people that sell them that the front bumpers from the w126 coupes will swap with the sedans. The coupes have foglights below so if you want them to work you'd have to do some wiring as the sedans don't have this. AMG, Lorisner and a few other (maybe not as good) do make compete kits for the w126. I have found from looking at them that they make the car look very dated. I am sure they were the hottest things around in the 80s, but put them on your car and it'll definitley look dated. There is a place in California that makes model upgrade kits for Mercedes, (they'll make your 126 look like a 140) and while these are pretty cheesy, you don't have to do the whole shebang (hood, grill, fenders, etc.). I think they have a more modern looking bumper for the w126. I forget the name of the place, but do a search because it has been talked about quite a bit on this site.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired