Looking at the pictures, I would say no. Near as I can tell, the hitch is just bolted to the bumper shock mounts. The pieces that extend inside the tubes on the wagon and are bolted up from below have not been used on the sedan. That seriously compromises the mounting system in my view.
Why not get a hitch designed for the sedan?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13