Remix of this thing:
I split this JB1 mount into 2 pieces in TinkerCAD, so that I could print it on my 8x8" print bed. I cleaned up the mating surfaces with a flat needle file, snapped the two pieces together, then used a few drops of super glue to make the bond permanent. The mount fits perfectly between the battery and air box.
I used the 12" velcro straps from this set (but any will do):