I picked up a pair of clean seats for my 126 on eBay a few weeks ago and put them in over the weekend. I was outbid on the door panels and rear seat or I'd have bought the whole package.
I like the lines of the seats on the 91 and plan to have my back seat recovered to match later on. The leather on my old seats was in rough shape and the springs were worn out on both seats. Sheepskins covered up the ugly leather...
But seats springs were really bad. For what I would have paid for new springs, I got these seats and the springs in both are very firm.
I went for a drive this afternoon. On curves that would normally have me leaning way to the left or right, suddenly everything was as it should be. And they look great...
I haven't gotten the trim installed on the passenger side yet...
I also picked up a new 3rd brake light and a couple of other trim pieces from this same car and installed them.
As I was swapping the seats out, I noticed that the back panels from the 91 will fit on the older seats. If your seats are in good shape but you prefer the leather pouch on the back of the seat to the older cargo-net style, this would be an easy upgrade if you can find a pair in the boneyard.
It's been a busy year for the Benz. I put a new stereo in and euro headlights last month. Tomorrow, I'm replacing the old rims with 15-hole replicas. Next, she's getting new front shocks, motor mounts and some climate control work.