Adsitco is good for NOS parts in my experience; sometimes you can get really lucky. They charge a premium though - and thankfully I've never had to deal with them w/ regards to returns.
Just noticed this post is from March! If you still need something
@Ascension let me know. I may be able to help (details below)
There's a
1995 E300D at the local junkyard which has a palomino interior and I can grab the drivers door card and/or that armrest if you need it (are the armrests on door interchangeable with coupe?). I recently grabbed the gilled diesel fender, the cluster, and some other parts. The palomino on the plastic parts seems to be a little darker than what is in my car (1987).
There's
also a coupe there at the same junkyard... appears to have alpaca gray for the interior though (and I don't know what shape it's in; just came in this week). It's getting to be the fun time of the year at junkyards as the summer begins here in Phoenix. It got up to 104F (basically 40C) on the day I was there last weekend