Depending on which one you're talking about there were several different lengths. The 4 arrow came in long and short. The short fit bows between 48" and 56". The long between 58" and 64". They were non-adjustable and right/left specific. The 8 arrow came in 3 lengths. The top arm could adjust up or down and the bottom arm was different lengths. They were right /left specific as well. As far as how to put them on, I can't post pic's here, but research some old Bear catalogs and you'll see how.