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6mm x 1.o bolts , wheel is drilled and tapped
just use bolts
drill and tap
do not drill through the plastic , punch through using the holes drilled through the wheel as a guide , then use a tapered punch , twisting by hand to expand the holes enough to fit the bolts .
4 bolts is fine up to 70 mph , i never go faster so i dunno if 4 bolts is good enough at 71 mph or above
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