bracurrie-
Sorry about mis-reading your post and sending us off in the wrong direction. I don't have any suggestions for the padding. I poked around a bit before posting just now, and came up empty. Good luck.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).