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I have found that on some websites they refer to the speaker sizes as 6.5" up front in the doors and 5.25" in the back doors with an extended cab. I have the extended cab model and bought speakers in these two sizes. When I went to install them I found that the rear speakers in the doors are actually 4x6". It is quite easy to check and from experience I recommend removing the door panels and having a look. If it is an extended cab GMC Sierra Duramax I can say with some confidence that the fronts are 6.5" and the rears are 4x6". Hope this helps, not sure if the duramax matters or not.
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∙ 15y ago
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