Which part actually broke?With Kuryakyn, that would be my approach... you can likely buy replacement parts short of an entire two-sided assembly. Those clamps are top notch, but those boards for Hwy pegs are awfully big and heavy. Look at ISO wings for replacement (small boards; lighter, cheaper, and less likely to break in a tip over).
So... that assembly includes the 1) clamps, 2) anti rotation arms (maybe in two lengths) that fit those clamps, 3) full size clevis, and 4) whatever male-mount a) Board or b) Wing or c) Dually pegs you choose to bolt on to the clevis. (I have the same setup with Dually's... a fat peg, and my bike has gone over and sits on the engine guard and the pegs cannot touch down at all, folded) Disassemble the broken side to see what is still good, or not.
http://www.jpcycles.com/product/zz53008http://www.jpcycles.com/product/zz53006If you have a hard time weeding through Kuryakyn's website for individual parts, you can call their tech folks for help, take down all the part numbers you need (then order them from an aftermarket seller or maybe Amazon). If you order from Kury direct, you pay MSRP.