Molson,
I'm not sure if Best Buy would be able to help me. The speaker is mounted on a plastic bracket which snaps into the door. Seems like a specialty item to me.
John
The plastic mount needs to be drilled out and reused. Once the mount has been removed from the door, the you can replace the speaker. When you have installed the new speakers in to the mount, you can ether rivet the mounts back on or use screws.
Just make sure you use lock tight and a light bead or silicone around the mount where it meets the door to keep any rattling in to future. If your not sure, just ask the tech's at Best Buy and they be more then happy to help you out and don"t forget the wire code connections.
2000 GMC Sierra C1500 Car Stereo Wiring Chart
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue