Losb3516 are 17mm hubs that will just bolt on to the LST2 8mm axles and include shims to go behind the 17mm hex adapter and knuckle. Losi 8ight series 17mm hex also fit but they don't come with the shims. One thing, if you go with losb3516 or any nonextended hex get 1/2 offset wheels to maintain the same width at the outside edge of the tires as stock. I personally used 1/2" extended 17mm adapters with my standard offset wheels.
If you'd rather have the stock wheels then you'd want the 20mm hex adapters that come stock on the LST2 and XXL's. But the only 20mm hex wheels are Losi wheels and the Losi wheels only take Losi 420 series or 40 series tires which makes for a limited selection.
LST2 parts for the front would be carriers and spindles as Losi calls them. Just don't forget the outer hinge pins that attach the carriers to the arms if you're buying separately.