Z-Sensor Bracket for Behind Front Fan

TL;DR: 12mm and 18mm Sensor brackets which fits between the blower fan and extruder housing.

18mm: X offset = -20, Y offset = -57, BACK_PROBE_BED_POSITION = 163
12mm: X offset = -17, Y offset = -56, BACK_PROBE_BED_POSITION = 164

Update:
As requested, I have added a 12mm version. I don't own a 12mm sensor to try it with, but it should work (if you try it, please let me know in the comments whether it worked). The offsets for the 12mm version are: -17, -56 (x, y) and you'll be able to set your BACK_PROBE_BED_POSITION to 164 as a result.

So, in preparation for adding a z-levelling sensor (18mm diameter) to my Anet A8, I went on a hunt for a suitable bracket. There are lots of great designs out there but everything I found which could fit my printer head had been designed to use the heatsink screws as a fixture. Nothing wrong with that, per sé, but I didn't really want to be moving my sensor every time I change filament, and I find removing the fan and heatsink is the easiest a