vanpro DIY Electric Skateboard 50,63 Series brushless Motor Mount(Snow Black, Pack of 1) Price: $14.30 (as of 24/03/2021 01:43 PST- Details)

Note that only round trucks are available in diameter: 18MM, which requires simple grinding of the trucks. If there is no processing capability, DIY products should be purchased with caution!
Adapt 5065 motor, motor shaft end plane screw fixing hole spacing: Φ30.0* 30.0, if 63series motor (6374 motor fixed hole spacing is Φ30, can not fit Φ40*40)”
Pulley belt perimeter range: 225-285MM