Good news for you. I have to concede the 60ft time with me on the bike, because I'm only getting to 33-35 mph at 2.5sec, and by my calcs you were 42-43mph at 60ft. Maybe I can tune the controller higher, but that remains to be seen. I'll own you by the 8th though.
Identical covers definitely, but there are hundreds if not thousands of motor factories that purchase components from the far fewer manufacturers of the metal parts and wind the copper, which is the highly labor intensive part, and assemble motors. My motor requires dropouts at 190mm, and definitely not something you can just slap on a bike. The X540x is more comparable my other scooter hubbies, but mine have big drum brakes that put the dropouts at 210mm without significant mods. Those wide version X5's will also come with bike ready covers, which is a complication for scooter hubbies.
I ride very much differently than you, so the weight distribution on the bars, pedals, and saddle will be way different. I'm still not happy with my hand position, and have to do something different at the stem, but weight distribution is right where I want. Keep in mind I want to retain a hand/arm position where I can push back to counter brake dive, which I really hate. I definitely need to experiment with one of the no-dive type of front suspensions. Due to my overall greater load I have plenty of weight on the front for cornering, but the fat Kenda has side walls that are way too soft for hard cornering. I don't ride that way anyway, and blast in pretty straight lines, so a muscle bike instead of a sports bike works for me.
I have no experience with decent bike shocks. Should I go ahead and order replacement rubber parts now...seals, rings, whatever? That Fox Float is like a cloud for me, and my greater mass must counter the effects of all that unsprung weight on the small bumps I've been hitting. The rear seems to take them better than the front, though I avoid big stuff.