I have a friend who had a ex that blew her speakers
i was wondering witch speakers she need's her truck is a 2006 GMC sierra 1500 need all four speakers changed out
I have a 2007 that I just put the Polk Audio 6 1/2" speakers below in. They fit just right in the front doors. My truck should have the exact same speaker sizes as the 2006. If she has an extended cab you will have 2 4x6" speakers in the rear doors. The ones below should work beautifully in your friends truck. If you have a Best Buy nearby go in and chat up one of their installers, they can point out other options. These are just my favorites.
Polk Audio - 6-1/2" Coaxial Vehicle Speakers with Bilaminate Polymer-Composite Cones (Pair) - Black
(133)
Polk Audio - 4" x 6" Coaxial Speakers with Polymer-Composite Cones (Pair)
(10)