Summary

Small bracket to mount the Part cooling fan to cool the Extruder motor instead of the part.
It's not completely centered but close, just did this quickly by eye.

Instructions

Just screws on the the Endstop Trigger, you need a 18mm m3 socket cap screw instead of the 16mm one that is standard there, I had a spare one with the parts left over when I built the kit.
The cap screw that usually holds the fan on the front isn't quite long enough (my poor design) by if you orient the print right (on its side) it threads snugly into the part an uses the layers as threads so no nut is needed.

Makergear M2 Extruder Motor Fan Mount