Pictured is a simple set of removable "Rocket Launcher" rod holders. The "Rocket launcher" style of rod holders are very popular and probably the most widely used type today. They range for a fixed angle of the tube to models which can be adjusted for different angles and directions. The brands Ram and Tite-Lok both come to mind for these styles.

This set of "Rocket Launchers" are made out of 1" and 1 1/2" pvc and is braced with 2 straps like the high back seats.