leaking spyder top

I just purchased a 2000 MR2...and I have 3 questions... 1. In order to reduce the engine speed in highway driving, what wheels/tires are usable on it? Can I replace the rear wheels (like the 2003, and up, models)? Where/what type would you recommend...price is a consideration, and they don't...

:help:My Toyota dealership is unable to order new window seal rubber for my 01' MR2 Spyder. Does anyone know of a supplier or dealership that has or can order now molding/seals? My car leaks from the top somewhere too... maybe it's from the seal for the rear window... or where the top connects...