Behringer U-PHORIA UMC22 under-desk bracket with wire holders

Friend of mine liked the design from Thingiverse but wanted a place for the wires to sit. 

The gap for the wire holder is the same on both sides only because I didn't feel like having a “correct” way to mount it. 

I included the f3d file if you'd like to adjust the size of the wire holder for the smaller wire (just remove the mirror constraints and have at it).