http://www.jspec.com/s15conversion.html
And no, no shop that I've ever heard of paints the parts before you ever recieve it. Thats like me asking a shop to go ahead and paint my S15 front end the same color of my car, and it just so happens my car has the rare gunmetal cobalt power puff pink of death red and chameleon pringles, and it just so happens my gunmetal cobalt power puff pink of death red and chameleon pringles paint job costed me 14k. So like they really couldnt paint it.
Get the conversion. Put it on. Take it to paint shop. Have them color match the color of your car, or just go ahead and paint it a whole new color. Gunmetal cobalt power puff pink of death red and chameleon pringles is a nice color.