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Yes they should fit. I have them installed in the front doors of my 2005 sierra extended cab. the original speakers clipped in so you will have to drill holes in door to mount them, but you will have to do that no matter what.
Sorry, there was a problem. Please try again later.Thank you for your question checking our car fit guide on JBL.com this would fit your 2004 SIngle Cab GMC Sierra
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