I have 2 Pacific Outdoors Insul Seats (green) and a Crane metal frame seat (blue). Insul Seats are $20 each, the Crane is $15.
Insul Seat: seat and back are 16.5"x16.5", strap onto canoe seat
Crane: seat 15"W x 12"L, back 15"Wx17"L, clamps onto canoe seat.
Contact via email in my profile.