MB Tex is great material. I still drive a '79 300TD with MB Tex and only a small area on the drivers bolster where my seat belt rubs has shown wear, its still supple like the day it was made!
OTOH, I bought seat covers from a well known reputable seat material supplier for a '75 230 and later moved them to my '71 220. I have to tell you aftermarket stuff is trash! It started rotting a few years after it was installed now its split at the seams. Bad deal!

The leather seats in my wife's '99 E300D has been covered with sheepskins since I bought it, I afraid to remove them but from a quick peek I saw its cracked a lot, the PO lived in the desert and hot, dry weather made it deteriorate.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!