If I remember correctly, scotts sells different arms with different bends/heights. Also, depending on what type of mount you use, that will dictate the combination of arm and tower (pin height) to use.
Finally, since I pulled my stabilizer off my old bike before I sold it, I had to get a new tower and mount. The tower was easy, a piece of solid stainless tube with the end notched. The mount, well I was supposed to have one made but my buddy flaked out and now im looking to just buy one.
good luck.