In my experience, I would call Works and order what you want right over the phone. They were very knowledgeable and straight forward to talk to. If you were to buy a used set, you would have to pay for the used shocks, then more than likely have to get them rebuilt. When they build the shocks for you at Works some of the questions they ask are your weight, style of riding and how long you ride for. I bought a set of Works Dual rate w/reservoirs and I have been very happy with these, but they did set me back $800.