This is a sturdy mount for a standard size toggle switch (mounting hole is 12.5mm/ 0.49" diameter). It bolts onto the bars in place of a mirror mount using the (typically) 10mm mirror mounting hole.

Seen in the pictures is a TPU cover I made for the switch with a small hole for the wires. Did not include this file because there are so many different size/type switches.

Print in PETG or ASA if you want it to last outdoors.