This ad is for a genuine General Motors Shark Fin antenna. I believe it is for the 2013 & 2014 Malibu ECO, LT, & LTZ only, but it is possible it fits other GM car models - please check with the catalog number I provided above to make sure before you place an order. . 

Already factory painted to match your car. I am not 100%, but I believe the paint color is "Ashen Grey Metallic" . It has never been installed, but I do not have the manufacturer's packaging for it. 

6 inches long

3 1/8 inches wide

2.5 inches tall