I recently fit a set of rims and tires to my car that were a bit to wide for the rear fender wells. On big bumps the car would scrub the outside of the tires on the fenders. As a temporary, cheap fix, while looking for a slighly narrower tire, I bought rubber spring spacers, and placed them in between the coils on the rear suspension. They did not act to raise the cars ride height in the back so much, as to temporarly prevent them from compressing to lower ride heights in the back. They also did not seem to affect handling or ride in any significant manner.
A cheap, quick, short term fix, but probably not something you would want to do in the long run.
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Domesticon Prime

93' LE V-6, 303K Km., fully optioned including Leather Interior. ES300 rear discs, twin piston front calipers, Depo Chromes with HID projectors, 17" OZ' summer's, 96 corner lights, MAF, timing, exhaust and intake mods, 2001 Toyota/JBL sound, + more and always more coming.