Crew Cab Rear Door Speaker

[j-ktm]

Hi all, I have a 2000 gmc crew cab (older body style) and the rear doors have what looks to be speaker grills in them. There aren't any in there but I was wondering if anyone has put speakers here or are they for an optional upgrade for the stereo or something. I am thinking of adding a set of 6x9 speakers here and I am just looking for some input. I am using an aftermarket cd player already so adding speakers shouldn't be a problem.

 

Thanks, Jason

[kosb]

I think if you go to crutchfield.com you can figure out what size the factory speakers are and get replacements. Ive used them a few times and always had good luck with them.