When i went to get mine, they gave me one that attaches to the front license plate mount. On my ford E450, the mounting holes for the plate are on the bottom of the mount, so thats where i put the EZ Pass gizmo. But first trip out i realized, some toll booths the pass would work and others it wouldnt. I finally read on the EZ Pass website that the gizmo had to be so many inches from the ground. I drilled some holes in the license plate mount at the top and mounted the gizmo there and have not had a problem since