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Check the Bosch's first. You probably have a 5.3 or a 5.4. Regardless, they're both the same price and nobody's gonna yell at you if you pre-purchase the wrong service. Heck, you can just send it in with your phone number on it and they'll call you and bill you over the phone.
Well we have the 5.3 I believe. If your wife's GTP's ebcm is acting up, just remove yours and send it in that way you don't have to worry with matching and programming if the need be.
2003 Grand Prix GTP-3.5 setup, sold it, miss it
2002 Grand Prix GT-top swap, GT1 Cam, SD Headers, 90# springs, 42.5 injectors, 3.4 pulley - sold
2012 Chevrolet Cruze LTZ-Summit White, 1.4Turbo