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Really pretty simple if you work steel and are a good welder. Made out of 1/4" x 1 and 1and 1/4" steel strip. Taper the up right piece to fit a long 3/8" bolt. Cover the bolt with small diameter pipe and some rubber I had floating about the garage. I made them to fit my legs specifically.
They are attached to the factory floor boards on my RTS with 2 ea. 3/8" grade 5 bolts and nyloc nuts( washers of course). They are VERY solid, much more so that the $180.00 hyw pegs I seen on other 's

Lew L