I modeled these up many moons ago for the BMW G450X bike. Adjust your rear suspension a bit to get a bit better handling and feedback out of the bike. Simple 7075 Aluminum pieces and you’re off to the races. Linked are STP files for the Left & Right parts, as well as the solidworks assembly files. The solidworks assembly also includes the fixtures for these.

Manufacture at your own risk and all that.

Solidworks Files HERE
STEP Files HERE
These are both ZIP files.