my question is what rim to use on ls1.com they say you can use convo pro 15x7.5 with 5 in backspacing and they will fit correctly.but wouldnt that mean my stock iroc rims that are supposed to be 15x7 4 1/2 backspace fit corrctly to.i tryed my iroc rims and they stick out pretty good. i also tryed my outlaw 2 rims they stuck out farther and with my lowering springs i cut the tire were they stick out to far.i guess what im asking is what 15 inch rim is everybody else using.thanks for your time