From what I can gather by reading other threads Jeep made some minor modifications to the soft tops after 2009. How difficult would it be to retrofit a 2007 OEM top onto my 2013? Are there some additional parts I need to purchase and if so what are they? If anyone has done this or knows of an online video or other resource that I could check out which specifies exactly how to do this and how complicated it is I would really appreciate it. Thanks!