This is what i've got on my 2010 spec 410.
HPI 75115 - HPI Cyclone Ball Studs, 4.3 x 10.3mm (4)
These go on the steering hubs and the alloy steering plate
HPI 75116 - HPI Cyclone Ball Studs, 4.3 x 13mm, (4)
These go on the outside of the front and rear hubs, and on the front and rear shock towers (you will need 2 packets)
You'll then need 4 x 3mm locknuts for the ballstuds that go on the shock towers "
But i just used the 75116 x 3 and backed them with M3 locknuts which imo is stronger then using the shorter ones with no nuts !!! Plus it looks more BLING
Ball cups are Losi LOSA6015 1 x PKT.