The Rebel comes with clevises for one end. If you do go with them, you are almost certainly limited to thin arms. Most of the aluminum arms are too thick and you end up using Ball Ends, which may offset the linkage a bit. I had bought aluminum arms prior to getting the airframe delivered. When I saw the OEM's clevises, I ended up using the nylon arms that came with the Hytec HS5585MH servos. Also, when I previously saw the wimpy OEM nylon arms that several of our local pilots are using on some of their planes, I decided to try the Hitec Nylon arms. This was the first time I did not use aluminum arms, though. I just did NOT have enough Ball Ends in stock, and I was in a hurry. So far, ... they all do seem to be holding up.