The buying link:
dual shaft version https://retail.uumotor.com/product/8-inch-off-road-wheelbarrow-motor/
single shaft version https://retail.uumotor.com/product/off-road-single-shaft-8-inch-wheelbarrow-motor/
50A single controller to drive two motors by Matthew Walder 
programmable motor controller speed close loop 60V 50A UART function by matthew.walder 
16x6.5-8 off road 16 inch 100nm geared single shaft atv motor by matthew.walder 
sine wave speed-loop multi function 30A programable brushless motor controller by matthew.walder 
15 inch fat tire 100N.m 800W electric wheelbarrow motor by Lavada 
11 inch 4000w 5000w 8000w HM tubeless detached rim scooter motor by redhotbits 
80km/h 60v 2000w 11 inch electric scooter hub motor by Raisa Olesnevich 
60-72V sine wave 3000w-3500w brushless electric scooter controller by mitchell shaffer 50A single controller to drive two motors $45.00 – $70.00 sine wave speed-loop multi function 30A programable brushless motor controller $79.00 11 inch 4000w 5000w 8000w HM tubeless detached rim scooter motor $390.00 – $415.00 16x6.5-8 off road 16 inch 100nm geared single shaft atv motor $180.00 programmable motor controller speed close loop 60V 50A UART function $155.00