farmer, Diablo door jambs should have a place in the front opening where the end of the strut ball stud is located. Make sure you have rigid support behind the fiberglass to thread in the stud. That will locate the shaft end of the gas strut. Use
www.Mcmaster.com number 6465K7, 270 pound. 27.75" extended length, reducible force gas strut.
With the door mounted on the hinge, lift the door so that the lowest front corner of the door skin is even with a line tangent to the top of the front and rear wheel openings. That will give you the correct amount of lift. Spot in the location of the hole you will need to pass the strut through the front of the inner door. Don't make the hole too big to start, you will have to "work" the hole size to suit through the travel of opening and closing the door. Also, VERY IMPORTANT, locate the strut cylinder inside the path of the window glass and locate the other ball stud on a solid support steel frame that is welded to the same structure as the hinge and latch. There is a LOT of force on the end of the strut.
After you get one door aligned, position the second door by leveling the car and opening the first door to full open position. Then locate the full open position of the second door by placing a level across the car from door top to door top. This will prevent any alignment issues between both sides caused by differences in the body/wheel openings from one side to the other.
I hope this helps.
RT