Fusion seat base only.  No seat or swivel included.  Includes 4 mighty bolts with knobs to attach to tracks in kayak.
The version for Frontier and Unlimited offers the highest seat position and is compatible with just those kayak versions.
The Flint and Pursuit high is the base that came standard with those models in 2023 and earlier.
The Flint and Pursuit low is the new base standard with those models in 2024 and newer to enhance the stability and performance.