Gas Cap Issue on 2006 Chevrolet Equinox

Can some put the part number used for the Equinox Model 2006,.

Asked by for the 2006 Chevrolet Equinox
Call the dealer and get a factory cap! Cheaper than aftermarket and a whole lot better. Have seen new aftermarkets fail an evap test!
YOU ARE SO RIGHT ABOUT THAT.BOUGHT A CAP AND STILL HAVE EVAP LIGHT.GOING TO DEALERSHIP FOR NEW CAP.ANY IDEA THE COST.
Pretty sure it will be a tad less than the aftermarket cap and have the retainer strap as well, if applicable. Have you had the system tested?
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It's a myth that most evaporative emissions leaks are caused by a faulty O.E. gas cap. That being said, why do you need a new one?