JDHOWARD,
Buy the welting with the bead and trim off the beaded edge. Saves trying to find an alternative!
I've been trying to find the same stuff here in Australia for 5 years now and have come to the same result...can't find nought!
I've ended up with 1/8 inch thick rubber strips that I have hole punched the bolt holes into.
Easiest way to go I reckon!
Best of luck...........Doc Bob.