well the aluminum c-hubs i got from rc-mart for $10 they are from an rs4 3. gpm brand.

the knuckles, and bearings I had from my hpi MT because I replaced those plastic pieces with aluminum. the drive cups from the mt are much stronger. those are all stock parts from the MT. the two ball bearings that meet the wheel are 5x11x4mm. on the inside they are
10x15x4mm. the drive cups are part number A549 5x40 mm axle.

The only fabricating I needed to do was to cut 3/16 alluminum tubing and use it as spacers between the hinge pin on supsension arms and c-hubs.

the axle sticks out a bit far but I also used MT hexes and they are much thicker. so when torqued down they sit flush. this was a cheap mod for me because i had these spare parts on hand.