This axle will only fit 2019 and newer Pro Cross/Yamaha sleds that come with factory outside wheels, these have a 1 inch slot in the rails where the axle goes through.
 
Runs four wheels, Dual 1/2" and 1" offsets which can run  9" or 10" on a skid originally running 8" wheels.    Uses 6205 bearings. Photo for reference only and not the exact product.