Used on a 2004 Chevy 2500HD. The two top/middle snaps do not match anywhere for the zipper to attach (I had to secure the top/middle with a zipper. I prepped the areas by cleaning them with rubbing alcohol and letting them dry until the zipper snaps into place) . . already less than a month after installing the velcro to keep the center valves open/closed it also doesn't hold up very well as I can see them popping as I drive down the road which may defeat the purpose.
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