Assembly is a little tricky, but I mounted it to a Motech KLR 650 engine case. The bars are 1 1/8". You only need to drill the backing plate one size up for extra stretch. A hole for a big screw. Plastic spacers for thinner bars are rubbish in my opinion. The only way to really get them spinning The only way to prevent this is to dig the screws into the stem without plastic or tape the stems and when I'm happy with the exact placement I weld them to the bar then the screws are superfluous.
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