I bought this, just waiting on a shipper. In the mean time, I am refurbishing a trailer and want to paint the fenders the same color as the truck. I suspect it's Nissan K27, Gray Metallic. I have the VIN but can't find a site that cross references code to VIN. The link above is a sample of code colors.
It looks dark in the shade and lighter in the sun.
Gray?
Remember that computer screens don't necessarily render colors exactly so what it looks like to you may be completely different from what it looks like to me.
It could be any of the 50 shades of gray.
I like the color.
It's super-tiny print, but looking at the brochure for 2007, it looks like the K27 Stone(?) Grey is the only grey that they used on the Frontier that year.
EDIT: It might very possibly be "storm" and not "stone" grey. K27 looks like the right code, but I can't tell what they printed for the name on the brochure.
There will be a tag like this on the driver's door jamb. It contains the paint code (highlighted in yellow)
Thanks guys, I want to finish the trailer while waiting but don't have the door to inspect the tag. It won't be a big production, but a trailer fix-up thread is coming.
I'm not trying to color match a bashed fender, just tart up a trailer a bit. OTOH if I make the trailer too nice ....
Dan
There's a color chip chart for 2007 Nissans here: https://www.autocolorlibrary.com/pages/2007-Nissan.html#parentHorizontalTab1 Note there are four pages, so check them all. Unfortunately there appears to be many different shades of grey/silver that were available that year so it may be difficult to figure out which one is correct.
The only gray available for the Frontier in 2007 is Storm Gray (K27). If you PM me the VIN, I can pull the original sticker for options if you care, but it is K27.
They're gonna be black. $25/can + clear coat = I like black. Besides, it will be easier to touch up later. 
It is K-27 Gray by VIN search. Thanks again.
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