I would like to get a set of slightly used rear tires for my 2005 Z4-3.0. The sizes are 255/35-18 and I have the style 107 Ellipsoid wheels. My lease is up in less than a year and I would hate to spend $800-$1K for a set of new tires. Plus, there appears to be a backorder from TireRack until at least October for these tires. Any help is much appreciated!