You can get both with a 1/8 shaft or 4mm. I would say to run the sidewinder 5700 combo on 2s lipo. Plenty of power for that car. I have a pair of tt-01 chassis cars, and have run a variety of motors. The novak motors do well, as do the cc motors. I currently have a hacker 5s 540 motor on 3s lipo. Trying to break 90mph, best is 74 so far. The feigao 380c motors work well too.
I am sure they would be ok on 2s. If you had one go for it, I would not buy one of those motors. Overpriced, IMO. Maybe a novak motor with the mm? I have a 5.5r that ios going in my xxx-cr with a sidewinder, so we will see if it works with the new firmware.