I found the exact product, and it's about eight dollars for enough to do a 67-8 fastback (12'). It's correct color, thickness and adhesive foam. Is is about a 1/16"of an inch wider than the original material removed. About 1/8 thick.
The label was in a clear bag. It has three running horses printed below the information.
Fits: 1983-93 Mustang Convertible. Top W/S retainer channel to frame seal.
&81-88 Mustang T-top w/s retainer channel to body seal.
#D338 Replaces: E3ZZ-7624484
If anyone needs a picture of the label and the material, advise. I will post.