The Transom Mounted Arch was designed for owner installation. Everything needed is included and shipped with your arch. If you are comfortable with hand tools, the “Trampoline” T-top comes with instructions and all the backing plates and hardware required for a thru bolted installation. Four holes are drilled in the transom for the installation. (Don’t want to install the Arch yourself? Check our “Services” page for professional installers with whom our customers have had a good experience).