Took some pictures for you Teddy. My setup doesnt pivot at the stock location on the hull side, its moved forward, Its pretty easy to get length, just prop your hood open and how far you want it open without binding choose 2 points Hull side and hood side measure it out.. then you have your exact length you need for a shock.. you can prob just do one side and go with a heavier duty shock, but I chose to do 2 so it would support both sides of the hood without twisting like the stock setup.
Mine is 19 1/4 in from end to end of the shock..