For the HPI Baja:
This shock cap set will wipe the shaft first seal and will seal the shaft with the second one.
The set is made for the 6mm shaft. You can use the standard brass bearing inside the cap, but it's better to use the HD triple set inclosed in our set.
Set:
2x Cap house
2x Wiper
2x Seal
2x spacer
2x C-clip
6x Brass bearing