Seeing that half the parts required for a complete assy are missing Art, just go with the Green Bearings, no seals to play with as they are part of the bearing, no need for for axle adjustment end play

I've used Green Bearings for decades on all my toys with ZERO failures or issues, many thousands of hard miles on the road, track, road course, cross country events, etc, etc, etc,...proper installation is the key to longevity

There's 253 million vehicles currently on the road in the US, I can guarantee you more than half are rolling on ball bearing axle bearings

Go "Green", you'll be glad you did

Mike