So, just to make sure I understand, the bottom of the seat (assy/frame I guess) is longer on the coupe, therefore it will not bolt into a sedan or wagon?
If someone who has a coupe and a sedan could measure and verify this. I looked at a coupe that was crap, but had really nice seats(my interest is the front seats). My wagon seats are leather, and aren't that great, so this could be an important factor in a couple of Mercedes that I am in negotiations for.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John