http://www.hardrace.com/Product_detail.asp?id=2807
I'm pretty sure that something just like that is what Tony used. Then modified the rack ends to be height adjustable to adjust out the bumpsteer.
But the angle of your axles is dictated by the wheel centre and the height of the gearbox. If you want to go lower, you can't fix the angle of the axles by adjusting anything at the hubs, you'd have to lift the engine/gearbox up.