Are any of your speakers not working, or only work intermittently? Most likely the problem is not with the speaker itself. Moisture can get into the door and unsealed speaker connector, resulting in corrosion and a bad connection. This can cause the speaker to appear "blown" when in fact it is just corroded connector pins.
BT DieselWorks has the inexpensive fix for corrded speaker terminals on your 2000+ GM truck/SUV! Available assembled with a 6" tail ready to be spliced on to you existing wiring, or as a "DIY kit" where you crimp the new pins onto the wires yourself.
Also available is the proper mating connector for the factory speaker connectors. This is great if you have aftermarket speakers that you want to hook up, but dont want to cut/modify your factory speaker wiring/connectors. By purchasing this mating connector, you can easily make your own "plug-and-play" harness for your aftermarket speakers!
Note: "speaker end" connector is considered male, "truck harness end" connector is considered female