Using 19 inch wheel on 2006 Pontiac GTO V-8.
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As per the car model an year details it looks like your car is equipped with either 17 inch or 18 inch wheels from the factory. Looks like either a 245/45/ZR17 tire or a 235/40/ZR18 respectively.
Going to a 19 inch wheel will yield a 235/35/ZR19 tire to keep the overall tire/wheel diameter close to the factory size to avoid having to deal with speedo and ABS recalibration. Tirerack.com does show 1 19 inch wheel fitment for your car. They do have sufficient data for backspacing and such available to make the correct fit to your car. You may want to copy that info down when you view the wheels just in case you want to shop elsewhere for wheels. Going to a 19 inch wheel may also limit your tire options as well, so make sure and research what tire you want before committing to a 19 inch wheel. You may find the selection of tires severely limited in a 19 inch.
These details will help.
Thanks.