I bought a set of four pads for my 1978 SL from World Upholstery & Trim, World Upholstery & Trim, American Manufacturer of Car/Auto Upholstery, Carpet, Convertible Tops, Car Seats, Headliners & Door Panel Parts for Classic European Cars like Mercedes, BMW, Porsche, Jaguar, Fiat, Ferrari and Alfa Romeo. They are made of foam impregnated "horsehair" and are very nicely done. Pricey though at $1000 for a set of 4. Worth it in my opinion, most excellent support and I will never need to do it again!

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1984 300CD (sold)
1973 220DPK 4 spd (died)
1978 350SL 4 spd gray market
2003 SLK32 AMG
1988 300CE (sold)
1997 E420 (Totaled)
1998 E320 Wagon