D - The fully extended length of the whole strut from centre to centre of the ball type swivels - 485mm
'Stroke' - The stroke fully extended (preferably off the car if possible?) - 200mm (off the car)
B - The length of the body (up to the start of the swivel fitting) - 250mm
The diameter of the body and the diameter of the piston rod (shown as 18mm and 8mm in the diagram). - 20mm and 8mm
Also the force required to compress one..... on a bathroom scale will be ok, in Kg. Probably best to measure the force needed once its started moving as the break free force will be higher than the constant force as it starts moving.... if that makes sense? - 45.44kgs
hope that helps