I have a somewhat similar problem, but with a 1986 560SEL. The front passenger floor mat seems to also have a permanent fold, it will not go down flat or fit well. And it always slides forward.
I'm wondering what people have done as alternatives for floor mats. I was thinking of just getting deep pile carpeting from a house and cutting it to fit. I think it will give it a more luxurious look. If I solve my problem I will let you know.
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