you wont be able to find them
there specaly made for emax and so is the speedcontroler.
I brought mine (scooter) without the battery for £3000 then spent anouther £2000 on a headway battery pack 120ah 48v instead of the standard 60ah 48v lead acid so thats £5000.00 in total ($8052.00)
The one thing I have noticed there new modle only uses a 4000w motor
probily a cost saving effort.
But when mine is at the end of its life i might consider getting anouther
here is there web site if you fanci a look
mine is the same as this but with the older 5000w hub and a upgraded battery pack and flashed ecu