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Those are actually for a 2013-14 GT500, if you buy the kit from any of the aftermarket places they give you the option to get the rear valance for the extra price and you cut the back of your GT up to make it look pretty. I don't know if anyone makes a Quad tip lower valance for the 2010-12.
Thanks for quick follow up. You are right I haven't found a valance for the 2011 and not sure I want to cut the existing. As an alternative, someone I know might be able to use and was asking if it would fit a 2019. Any thoughts?