Dual Solo Post Model 12xx: 

This patented shock-absorbing dual pedestal system is designed to be mounted to most seats or a universal flat-bottomed seat slider for fore and aft movement. Two standard posts are utilized to accommodate larger helm chairs and greater seated weights. A custom deck plate is included which allows the pedestal system to be adapted into a standard round 8 ¼”, 6-hole bolt pattern. A swiveling fore/aft slider is available for this model.