i've been lookin into the muggy alot lately, found lots of info on
www.lstforums.com.
what you basicly want is 17mm hexes instead of the stock 20mm ones.
most use mugen ones. need to shim them tough.
you can also use hpi, hotbodies, sportwerks, 8(T), hyper 8 and maybe even more.
since you have a sportwerks put those on the muggy.
then you can run NON-offset truggy wheels.
your truck will steer alot better that way and it doesnt really need offset wheels as it is lower C.O.G. then the lst2 its based upon.
if i had racetrack around here i'd run GRP gandini grips or cubics. they are premounts on 3.8inch wheels, they are quite narrow. work really well.(from what i read about them)
other wise you could run pro-line mtr's, on mugen (MBX5T) wheels or so.