That's deceitful. It clearly states in the ad that it's a receiver hitch.
When you go to Valley Industries web site and do a hitch lookup, it does not list MB in the possible choices. So, apparently, they don't make hitches for Mercedes. I've run across a similar situation with that hitch for a TD at another company.
JC Whitney used to sell a Dalan receiver for the TD but they recently switched to Valley hitches and no longer show MB in their look up.
Dalan has the hitch but it's pricey.

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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