From surfrodz themselves:
Only placed on truck for fit. Never rolled on. No nuts included.
This is not the answer for you are looking if you got hubs with pulleys that need lots of clearance.
No comment on their fit on non-SF trucks.
Selling for 4 axle extender/converters (enough for one board) for 80$ I’ll cover US shipping. Surfrodz shipping was exorbitant.