I know at least on TireRack, 215/55-15 does not exist. 205/50-15 will throw your speedo way off and create a huge wheelwell gap. There are plenty of great tires in the stock size. I'm currently running Dunlop D60 A2 JLB's (for those who read this that know, I've temporarily removed the SVT rims until I can afford a new set of KDW's). Go to
www.tirerack.com and look around. Good info.