This came off one of my bricks. It worked surprisingly well. The top tubes and bottom pieces bolted to the normal crash bar bolts, so still have the rubber flexibility to protect the bike from damage from a light fall. I think the previous owner said he used a crash bar from an R100. I had foot pegs bolted on, I think there is a photo of them here somewhere. Probably a single bar would look better, but something temporary like this might be good to find the most comfortable height to set it at.
I think I had the pegs about a quarter of the way up the vertical sides. You might think the engine covers are in the way with your legs, but they're not, it worked well. It feels good sticking your feet out into the wind, and you still have the normal pegs.

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