This is the one I got. I use it with my Micro Swiss. It did not have a flat spot on it for the set screw. It was round like the stock creality, so I just spent a few minutes on it with a file and ground down a flat spot on the shaft. It’s been working great. It did seem to be running a little hot though. I probably could have reduced the voltage a tiny bit, but I just bought these stick on heatsinks.. Put them on the extruder, X, and Y steppers and they all seem to run significantly cooler.

These work great. No need for a fan unless something else is going wrong. Easycargo 40mm Heatsink Kit... https://www.amazon.com/dp/B07D4FVC61?ref=ppx_pop_mob_ap_share