Impactplayr- I will check that out on the mission. On the A2 every set up I've seen called for 66mm shock length so that's what I always ran. I've had to go to 67 or 68 on the A2 to run the outer shock mount on the arm. I've seen other team drivers set ups for the mision and they were also running 66mm so I never thought much about it. I usually run between 2 and 4mm of droop checked with an ascociated type guage.-James