An axle with 5 studs :P
Say, like, the rx7 hopper stopper kit for the front like Taz said and a Hi-lux diff for the back.
But in the term of it, you've got to ask yourself "Is it really worth the hassle?"
Like, are you planning on running massive horsepower that needs huge brakes and a heavy diff ?
If its just a charged 5k that your planning on i wouldn't bother wasting the money.
Its not just the parts and labor that you'll be paying for but also the cost of a mod plate just so that you can pick from a board range of the wheels.