67 Barracuda Cat Whiskers

I remove interior door panels and alter the glass travel stop cam on the regulator. The glass will roll farther down into the door so felts R&R easier.
The glass channel run kits and the guides alone have been sold out for quite a while now.
One member here claimed he used the loop side of adhesive backed hook and loop (commonly known as Velcro). He simply folded that felt like material around edge of glass and reinstalled original guides. The stuff can be found in Walmart craft dept' but... higher quality can be had too.
Industrial Strength VELCRO® Brand Adhesive Tape On A Roll
I'm guessing 3/4 wide would be about right.