I have the same one as Obermd in my 2012 Eco and yes 16 is the size. That is because it was initially intended for the LS and LT models with 16in wheels not the Eco with 17s not sure if the LTZ has one. But you are looking at the right spare. The only problem with the smaller wheel is if you have a flat in the front, you would play a little rotation and put the spare in the back and move the wheel from the back in the front. At least that is my understanding.