Rear Seat:
Hips= 25 5/8", but If you want to include the rudder cable and fairlead that are right there in the corner, you only get 24 5/8".
Head= 27" glass to glass. If you want to be realistic and include the window frames and fuselage structure in that area, you only get 24 5/8"
Front Seat:
Hips= 25 5/8" , but the trim wheel is right at your hip joint area, so you only have 23 7/8"
Thighs= 23 1/16", with the flap lever in the flaps down position
Head= 26.5" glass to glass, 26 inches if you are realistic and include the window frames, etc.
The throttle cover panel sticks out pretty far, so remember that you'll lose a bit of elbow room there, too.
Hope this helps.
This is from an A-1B.
DAVE