Thanks to everybody who replied, and particularly those of you have spares you'd be willing to sell (please see PMs). Yes, I do know about Andover and Ssnake-oyl; the material they use is nothing like the original Porsche/Repa. Unfortunately, I cannot have the originals re-webbed in any case, as a PO removed the front belts circa 1980 and replaced them with a set that does not mate with the original Porsche receivers that are still in place; presumably, he drove around without functional front seat belts! The replacement covers sold by SMC are fine, by the way, except they won't fit on the (wrong) belts they sell (go figure).

Rich