This seat has been discontinued by Wilderness Systems! The page is left here for your reference. A substitute seat is unknown at this time.
Replacement fabric parts and straps are available (the frame is not):
Came with a Bracket Kit, not shown in the photo above! The Bracket Kit contains assorted parts, hardware and instructions. See the AirPro MAX Seat Bracket Service Kit Video to shed some light on the matter. Seat frame is 24 7/8 inches at the widest, see Detail Photo of AirPro Max Ride Seat.
More information: AirPro Max Seat Instructions
See the AirPro Max Overview Video.
Best used as a replacement seat for the Wilderness Systems Ride 115 X Max AirPro Max Seat with Support Brackets. The AirPro MAX has a forward and aft trim range plus a three phase (high, low and recline) positioning without any clipping or loosening of straps. Aluminum frame. All-weather, breathable textile combining an open weave fabric with a 3D mesh filler for the ultimate in comfort. Backrest straps allow for adjustments of the seat back angle. Easy access grab handles allow the seat to adjust quickly to low, high or recline. You can attach accessories to slide rails. The forward-aft seat positioning in the Ride model kayak is preserved with a unique injection molded rail. SOTFRAMESEAT