I would have to see them but like you said the XLE offered alloy wheels on both the 4cyl and 6cyl models. It is also possible that they are specific to a certain region. I know there are wheels taht are available here in the SE taht are not available in other areas and vice versa. Can you get some pictures of them and lets see waht they look like. Maybe someone knows for sure if they are actually factory or regional specific.