I'm running this one, creality-styled extruder. the page says it's official but I absolutely doubt that. Bottom line is it works. In the few weeks I've had it, I haven't had to re-calibrate my extruder at all.

I'll edit my post here with the video instructions I use because the recommended instruction video sucks.

Edited: Here's the assembly instruction video I used. I've posted about this before but I still recommend it.

Good luck, I hope you find what you need!