I'm not familiar with the '36 set-up, but I suspect the clutch pedal rotates the shaft to operate the clutch arm on the inside of the x member. The shaft rotates on bushings within the bracket bolted to the frame. The shaft in a '40 bracket is stationary in the bracket and both pedals rotate on the shaft. It might could be done with machine work, most things can. Most people just use a '39 assembly to convert to hydraulic brakes.