6 " Thanks! I actually already found out that 6.5"s will fit too because that's what I put in.
6.5" in all four doors
5x7 or 6x8 All Doors
No if its a crew cab they are the same as the fronts. Which is 6 3/4 speakers. You can buy 6 3/4 speakers which are not too common or you can buy adapters that will make the more common 6 1/2 fit.
6.5 front.........5.25 rear
http://www.crutchfield.com can tell you speaker sizes for any vehical.according to Crutchfield, you can use 5" x 7" or 6" x 8" in the front and rear doors, remember to always consider radio output and when replacing speakers.
6 1/2 front and back
Front speakers Front Door: 6-3/4" factory speaker note Far rear speakers Rear Pillar: 4x6" factory speaker note
The front door speakers in the 2001 Silverado 1500 HD Crew Cab measure 6 3/4 inches. The rear side panel speakers measure 4 inches by 6 inches.
front 6x9, rear 6.5
6 3/4" speakers front and rear in a four door 2004 Chevy Colorado.
6.5" with separate tweeters in front and 6.5" no tweeters in the rear.
crew cab door speakers are 6.5"