Here you go, from the top:
35mm, 40mm above 2 1/4x2 1/4, 26mm above 2 1/4x3 1/4, 30mm above 3 1/4x4 1/4, 30mm above 5x4, 30mm above edge of upper bellow flange. So the pointer should be on the 5x4 marking with the upper bellows fully compressed. The total bellow extension to the 35mm mark should be 126mm.
All measurements to the nearest millimetre.