There are some supplemental pads for the seats which became standard around '92 I believe. They are from a TSB "Front Seat Bottoms or Is Too Soft" for customers who complained of lateral movement. My '92 wagon has them and the seats are much firmer laterally. There are 2 per seat and are pretty cheap each. I bought some to have ready for when I finally get around to rebuilding my seats. I believe these are the part numbers, but should be double checked when ordering.

Part # 124 910 14 50 (Tex)
Part # 124 910 12 50 (Leather)

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David
1986 300E Anthracite + ECodes + MB Mileage Award