There are similar foam stiffening pads that are for the W124 and W201 front seats. there is a set for the rear also but I did not install them, who can get people to sit inteh back seat of a w201 when there is a large adult in the front seats? there is like 4 inches of room for their legs.
Anyhow, i installed the foad blocks in the front seats of my W201 2.3-16v and the seats are a completely different animal now! A much better comfortable animal. The seats dont sag or bottom out on the front corners any more and they feel much more firm and fitting. I like them much much better now the foam inserts are in place. I ordered them from the Dealership for very little money, I think they were 8 or 9 dollars apiece and they are a more formed, larger piece than the ones for the W123 car seats.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red