They are a 6 3/4" size.
You can replace them with 6.5"/6.75" speakers from www.bought4less.com
They have a large selection.
They fit like stock, but sound terrific.
: truck is a 2000 chevy z71 extended cab.
: what size are the speakers in the doors and in the rear extended cab
: i do know i have the separate tweeters in front doors.
: what kind do you guys recommend?
: i am keeping factory head unit for now, BUT will be changing it later.
: also how do you get to rear speakers?
: if any of you have a link to a page for that that would be great.
: thanks for any help and advice in this matter.