I laid a 24" level on the seat cushion and leveled it. Passenger side is 13.25" to the floor, center of seat where I would think is the least likely to be used-13.25 inches to the floor.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy