This Wilderness Systems Aspire 105 Seat Bottom Structure (aka seat pan) is best utilized as a replacement part for the most recent versions of the Aspire 105 kayak. It might be used in some other kayaks, but information on that is unknown. Seat Dimensions: 25 inches at the widest. About 10 inches high. Front to back is about 12 inches. Seat posts screw holes are 23 3/8 inches on center. You may need some Phase 3 AirPro Parts and some mounting hardware to make the seat complete. SEAASSY