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The rear speakers on my 2004 34D were smaller than I thought they would be. I believe they were 5-1/4" rounds. On the passenger side the rear speaker was accessed by removing the interior side panel of the cabinet. The one on the couch/dinette side was accessed by removing the fabric covered panel on the underside of the overheads. Because the panels are fabric covered the only easy way to replace/upgrade the speakers is using similar sized, mounting them from behind like the originals. If you want to install a larger or different shape you will need to remove the fabric and re-work the cut outs. I would suggest opening up the access panels before buying your speakers. Looking from the outside you would think you can easily fit a 6x9" in there but there is not as much free space behind as you would think. I also had to install some spacers on the speakers because they protruded beyond the mounting face.
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