[rockfla]

Acchaplin
Unless you find someone who has some old material left OR lying around, the original material is un-obtainium. Haartz is the main manufacturer of the “Stayfast” canvas and we were informed by a Haartz supplier they “ONLY” make a limited color offering AND some color offerings like green, they only do lot runs of that color every 8/10 years or SO and that is it till the next run of that color, if it runs out before hand then it runs out!!! I am most certain LB had custom lots run several years apart ordering, a bare minimum linear footage amount each time, maybe more. I would also bet, that custom run took months IF not years of planning for that to take place. SO, IMO, you are on the correct track on the search for the Dark Tan with a tan backing and to be satisfied with that.
NOW, with that said, I had heard, at one time, there was a certain “special” material Stidabacker used on there interiors and was “specific” to them only. The National Studabavker Club solicited all it member for a fairly reasonable donation and they contracted with the material maker of that time to do a “special” run of that material and the club stored and sold it to its memebers. I don’t know how true it is OR “IF” that could be done today but it would take the financial comitment of “many” to make that happen. I for one would be a potential willing investor in such an endeavor.