Outboard side bolsters always take a lot of abuse. I have a small hole in mine from years of belt loops rubbing against them on entry.

If you want to do an EASY cosmetic fix, look at colorplus.com . I've ordered dye from them which comes in common MB colors without needing to pay extra for custom color matching. The gray one, at least, is a perfect match. Every year or so I retouch the side bolster on the driver's seat and it looks like new. This year I need to fix the hole. It's easy. You put some canvas behind the hole, and glue it to the back side of the leather by contact cement. You then cover the patch and the hole with a flexible patching compound (colorplus sells this) and when dry you redye the area.

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Steve
'93 400E