Details
Upgrade is to suit 2 hubs. (single axle)
to suit bearing numbers
2X INNER BEARINGS ID:31.7MM (LM67048)
2XOUTER BEARINGS ID:19MM (LM11949)
or
2X INNER BEARINGS ID:34.9MM (L68149)
2XOUTER BEARINGS ID:22MM (L12710)
or
4X INNER BEARINGS (LM68149) (parallel axles)