I got some stuff from JC Whitney years ago to rebuild the channels for my 2-door wagon. It is probably what you need. However, the part number I had years ago is no longer recognized by JC Whitney's web site. You might want to spend some time on their site poking around. They used to have good descriptions and diagrams of what they sold.
You also might want to poke around on this site to see if they have what you need:
https://www.steelerubber.com/