8" Knobby Tires

Wheel tooth bolted to rims were 1/4” to wide to fit my application even with spacers ran out of room to bolt the tire to the trucks. Had to grind down the gear so they clearance, also had to modify the bearings as well being to big i was hoping i could have just ordered 8mm bearings to fit in place but they don’t make such thing. Am curious what truck setup these were mention to fit on cause i had the widest set of trucks i could buy.