I have a 2010 Nitro Z9 and the trailer has Vortex hubs with the rear set being disc brake hubs. Do they make just the bearing packs and rear seal for these or does the entire hub need to be replaced? If so, does anyone know the part number for these, or the lb's per axle I should go by for purchasing? Any and all help would be great here. I've got a little seepage coming out of the rear seals and I don't want these to dry out. Just doing a little preventive maintenance. Thanks.