most struts come with axles, if you go electric retracts, you'll also need struts, a y-harness, and possible servo extensions. magnum rc sells struts also and robart does too, some excamples. with robarts you can cut the strut to lenghth, with lado, you buy what length you need
http://www.robart.com/products/38-di...ight-robostrut
http://magnumrc.com/lado-oleo-strut-...-ea-p-184.html