Thanks - I'll visit a local auto body supply shop and see what they have.
I made a 1/8" x 1/16" strip of aluminum by cutting a 4 ft long 1/16" aluminum flat bar. Took a great deal of effort to cut if 'fat' and then file it down to 1/8" wide. It looks great, fits in the channel really well, but needs to be 4ft and almost 1" long to make the entire circumference of the wheel. :doh: Should have measured first, I just assumed 4 ft was long enough.
I haven't found a longer run of 1/16" aluminum, so your method is the way I'm going to go I think. Thanks again!