So I tried the soda can idea. Didn't work. My father-in-law, being a contractor, had some metal pieces laying around. I'll try to get some pics tonight and post them of the number holders I made, and used for the MS City to Shore in Jersey this weekend. It worked pretty well, was pretty easy to make (as long as you have the tools), and easy to instal. It is definately not for the weight weenies, but it gets the job done. People thought I was trying to use my rider number as a fender with the rain, but then realized what it was. Got some complements on it.