A lot of years ago, it was hard to find the welting and the various stuff required, so out of need, I used naughahide(sp) seat fabric. Cut a strip twice as wide as needed, folded it over so the (leather) side was out and installed it flush with the surface. No exposed bead above the fender/bodyline, cheap and available. And as mentioned earlier, likely in a color that will match what you have. Still was there alot of years later, with no ill effects. Sniper