I got it off Amazon:

URBEST 8mm Detecting Distance Approach Sensor Inductive Proximity Switch NPN NO DC 6-36V Cylinder Type https://www.amazon.com/dp/B01M1777XK/ref=cm_sw_r_cp_api_i_FYR22V87BVPABCDWAPPF?_encoding=UTF8&psc=1

Wire it to the z switch input. Download an induction specific firmware build from mrioc or make your own.

It’s so much easier than bl, and more accurate.