If you have a vice, cut off wheel or grinder and a good heat source (torch of some variety) you could make it out of some thicker gauge aluminum about as easy as the one in your photo. Just bend it slow and keep it warm while you are bending. There are several metal supply shops in town that sell remnant pieces of aluminum
RS 125
TZ 250
#738
Or call Denny Burke at Brighton Radiator. Good guy, amazing welder/fabricator and been with the club a LONG time.
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MRA#217
Th'ink Tank Tattoo, The Walnut Room, Rocky Mountain Kawasaki, STM Suspension, Sol Performance, Pirelli, Speedmetal, BloodNickel, MadMoto, Puma, Woodcraft, Armor Bodies, VonZipper, and
Lacy
I got them made. Thanks to Advanced Alloys in Longmont. Super fast and good prices. Also he is very into motorcycles and likes what we do.