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Not knowing exactly what I am looking at, do you possibly have a picture of the regulator with the flocking or channel, even if it is just some pieces of the material. We stock most of the available pieces to repair a regulator, but I can only think that it would be something like glass setting tape. Some used a piece of material like a stiff gasket material. Is the regulator on the other side in better shape and offer a better view of the piece?
If you can lay a tape measure down so that I am able to make out the dimensions of the channel, then there is a good chance that we can provide a very close piece to fit your needs. Glass channel usually runs either in a 1/8 or 1/4 inch thick glass, but the height and width of the base makes a difference. The linear length is not an issue as most of it comes on rolls from 100 to 500 feet to a roll, you just cut to the desired length.
What I have available is as follows, all is for 1/4" glass:
Part Number Height Width at Base
4515 9/16" 24/64"
4516A 1/2" 7/16"
4516B 5/8" 7/16"
4588 9/16" 7/16"
Let me do some more checking into this. So you are telling me that the height is 3/4" tall from the base of the channel to the top and the channel is 7/16" wide at the base. I am assuming that this is a flocked rubber piece.
Weatherstripping flocking is known as small fibers of fabric is impregnated into a rubber extrusion. This process became common starting in 1963 with the Mopar weatherstripping and allows items like the door glass to slide with less effort between two opposing surfaces. If you can imagine your door glass sliding on a wet piece of rubber, it tends to want to adhere itself. With the flocking, it slides better.
Both profiles that I looked at today was 5/8" wide at the base at the widest point. The "wings" could be trimmed back I believe to fit the channel. Both measured 1 1/4" tall, but the height could easily be trimmed to fit. One profile is used in the "lock strip" for the 68 to 70 B-Body post cars and the other profile is used on the E-Body quarter window channel. Neither profile would double back over the channel as yours does. I have two more profiles to pull tomorrow, but I am thinking that both will be much wider than the 5/8" ones listed above. I will also check the window channel as used on the 61 to 78 model Dodge trucks. It is 7/16" wide at the base, but I believe that it is only 5/8" tall.
One other possibility is "mohair channel liner". We use this product on relining the division bars on the 62 to 65 B-Bodies. If you can imagine the fabric that velcro attaches itself to, this closely mimics the appearance. It is finely textured mohair lining material with a rubberized backing that is very flexible. You can simply place some 3M style weatherstrip adhesive in the channel and then push the liner into the channel. We use basically wooden spoons to smooth out the wrinkles and to push it tightly into the corners. Once it dries, you can take a razor blade and trim the excess off.
Checked the truck application today and it measures 1/2 inch wide at the base and is 5/8 inch tall. Do you happen to have a upholstery shop in your area that does street rods and other custom work? You might find something that would work with some slight modifications.
Attached is what a profile basically looks like. This piece is used on the 68 to 70 B-Body Hardtop lockstrip run. Convertibles and coupes are both different as your finding with your car.