im not sure which ones you need for your car. i would look at ZZP for what you need and then try to find them somewhere else cheaper.
thanks bro
2007 Pontiac Grand Prix GT Series III 3.8 Super Charged AL 104's Plugs, 180* T-Stat, Tuned PCM , Custom CAI is complete and installed, AeroForce Interceptor gauge, Smoothflow 3.5 pulley with 0* KR, SSAC SS Headers. 6000K HID