Hey Ex 6 -- (sorry, but a first name might help if you are comfortable with it!...) Welcome to the group. I agree with Cees that GAHH is a good choice. Also maybe Miller's or Bud's but GAHH is the gold standard in soft tops and upholstery I'd say.
And yes, please post what you find out. I bought my full set of MB Tex from Miller's back in 1997 (yikes was that really 15 years ago?)
anyway they are still in good shape WITH one major exception... Where Brodie the Border Collie Puppy decided to take a bite! Last time he'll ever pose for a pagoda photo... so I hoping to do as you mentioned and just send the bottom part of the seat someplace and see if they can redo just that part...