You can go to Walmart and buy the adapter that replaces part of your dash and takes a standard H/U. You'll also need the antenna plug adapter to go from GM to standard. Go to Crutchfield.com and put in the model of your truck, and it will show you various H/U that will fit. It should say adapter required. Click on that and it should show you what you need. (At least that's how I remember Crutchfield's site). Or you can go to Best Buy, they should have everything you need. About $15 total for adapters.