I have just bought 6 of these and 1 of these packs.
I'm pretty sure that the current motors on my CNC's are NEMA 17's but even if they are not I can buy or make some kind of alternate mounting plate or just use them for a 3D printer if I can't make it fit.
In other news having moved out I don't have anywhere to put my HF antenna but soon I should be able to get my 2m rig online from inside so I won't have to go out to my car to talk to someone.
Cheers,
Rex