Have you considered Sheepskins?
I suspect that a good pair of sheepskins would do the job of getting you off the MB-TEX, and would be very comfortable and warm. I put a fitted pair in my car for about $275, and I doubt that you'd find seats for that. Also, the Sheepskin Store installed them free of charge.
Just a suggestion...
'82 300D/4.3L V6
'77 Jag XJ6L