Dave it depends on the face of the back part. What is the diameter? I think the WindS takes no more than 50mm. The nose part of the fuse tapers and you cannot mount a flat faced 63mm motor to the nose ring mount. I do see that the EFlite is tapered too but how much is the taper? Best bet on 8S is Hacker/Scorpion and one other China brand that I now forget, same shape as Hacker. For 10S its Scorpion only so far.