doesn't matter what retract body you use air,mechanical, or electric ,when you get the wing built up and the retract body installed you measure the location of the wheel at the well, when you have established the location you then cut the strut to size and use the adapter to mount the strut to the retract body using the strut wire as a connector,its about fitting the strut to the wing you have built not the other way around.
your going to have a bit of variance due to the location of your retract body, when I cut one strut I just make sure the other one is exactly the same.