I can do better than that John, I can post you one of the units for you to measure, you can send it back or give it to me at one of the jet meets once you have got the dimensions you want. PM me your address. The cylinder is inadequate, the diameter is far too small, it works on the bench but can't raise the legs in the air but it would work if you can design in a much wider cylinder. I took the units out and replaced them with lowish profile Trim units but they do sit a bit proud of the wing, adapting the real low profile units to take a wider cylinder would be the proper way to go.