Really depends on the quality of the bearings and if the rim where the ball bearings would go has not been damaged. It sorta like every trying to invent a better mouse trap. In this case these ball bearing are for those that are too lazy to grease the spindles every so often with good quality grease.
As for the above bearings you can just get the bearings themselves. Search PN AM127304. Here is a link to enough to do five rims/.
XIKE AM127304 Replacement Bearings