I have a KF3 finished in 93. The original foam in my seats is kinda worn. I have some 2" foam, cut to size to fit under the seat upholstery. I am 5'6" and use 2 of these behind the back and one under. It moves me forward and up and gives me adequate reach to the panel and controls and over the glare shield.

Only caution is to make sure the cushion foam you add does not impede the control stick rearward movement.

Ralph