The first step after ordering is measuring. The height and curvature of the arch are important, as is the arch's fore and aft distance. The Highline top comes with a "well" (a recessed cutout) that fits over the arch so that the arch nestles within it. The well is long enough (fore and aft) to accommodate most if not all arches. That extra distance also provided some flexibility in mounting the top when it arrived, as it could be moved somewhat forward or aft depending on the owner's preference. I wanted some overhang over the windshield, and so had mine mounted a little more forward, creating a brow.