wrx wheels are 7 inch and sti wheels up to 2005 are 7.5inch then 2005 on sti are 8 inch
and as correctly asked by kohn its important regards the width as it you strech the tyre to much then esp under the load of a track day the tyre can pop
happens alot with the vag guys that try to strech skinny tyrs on to wide wheels,
215 on your 7.5 inch wide wheels will be fine tho john.