I have the interior from a 1991 350SDL (one of the rarest!!) in my '82 300SD. Only main issues were the memory front seats, I removed the memory modules and converted them back to non-memory, and my switches in the door lack head-rest adjustment provisons, so they can't be moved easily but with a lot of soldering the other functions all work great.  Way more comfortable than '82 seats thats for sure.
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