Looks like there are a lot of good ideas in this thread and I thought I'd throw mine in. I mounted the Grubee to the seat post tube with the stock mount. The tube is 1" and all I had to do was cut some 1/16" rubber to use as a shim. I made a front mount by welding together some scrap 3/16" steel into a "T" bracket. Then I used a 1" Three Piece Clamp to go around the frame tube. Three piece clamps can be found in motorcycle parts catalogs in sizes from 1" through 1-1/4" that I know of so you should be able to find one to suit your needs.
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