Per my original window sticker, the side curtain air bags were optional. It's listed in the option packages section. Ironically enough that was the only option ordered on my car by the first owner. The only options avaliable were the sun and sound package, which upgraded to the CD 6 and a moonroof, and the navigation radio. Everything else was standard on the GXP in 08. I believe onstar and Sirius XM were optional in years prior, as well as the dual zone digital climate control.
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