A:Answer When replacing your factory radio, you'll need a special integration adapter in order for the new stereo to work with the car's electronics system. There are two versions of this adapter, depending on whether or not your car has OnStar. If you have OnStar, then you need the PAC OS-311B adapter. If you don't have OnStar, then you need the PAC C2R-GM11B.
Next, if you want to retain the Driver Info Center, your new stereo has to be single-DIN size and you need a second integration adapter—the Metra 99-3303. If you don't care about retaining the Driver Info Center, then you can get either a single-DIN or double-DIN receiver. Finally, if you want a double-DIN receiver, make sure it doesn't have a fold-down face. That style won't work in this dash.
