Many kayaks come equipped with the preexisting external mount bases and rod holders designed for Scotty, RAM, Cannon, Fish-On, and many other variations of rectangular, four-point installation bases. We get it! This makes it really difficult to add RAILBLAZA bases and accessories to your kayak because the preexisting bases and accessories that you got stuck with are already installed to your kayak! Not anymore! With the invention of the RAILBLAZA StarPort HD – a rectangular, four-point installation base – you can easily remove and replace your old bases with a RAILBLAZA StarPort HD! Not only does this transition to RAILBLAZA base give you the comfort of the RAILBLAZA's ‘slide locking mechanism' fit to all of the bases and the versatility to effortlessly retask accessories from one base to another, but the transition also opens up your accessibility to RAILBLAZA's large selection of accessories and limitless rigging possibilities! StarPort HD also is compatible with the same hardware that is currently used to keep your base mounted to your kayak! Other options for installation hardware include rivets, screws/locknuts, and the StarPort HD Track Mounting Kit.