The 4.5″ StompFin is compatible with both StompBox 1 (2015-2020 river boards) and StompBox 2 (2021 river boards and newer). The rest of the kit components are sized for the StompBox 1.
Kit includes:
– 4.5″ StompFin
– StompBox Insert
– Spring
– Spring Plug
– Fastening Screws