[coolhandcountry]

The 1950 has a 19 x 50 mm rotor.
The xl can motors have a 19 x 50 mm rotor.
The lehner is much higher quality.
The neu has some odd size listings. The 15 12 is about 60 mm long in can.
They are fatter in diameter though. It is kind of go by the kv rating to fit your needs.