14-19 HARLEY FLHX2: Mustang King TourPak Extended Arm Wrap-Around Backrest (Summit Vintage) Mustang&#39;s Extended Arm Wrap-Around Backrest is proudly handcrafted in the U.S.A.Rubber washer mounting system eliminates the troublesome soft stock isolators.Arms are extended an extra 2" for added comfort.Thicker foam padding provides comfortable arm Only works with 1-piece Ultra Touring seat. Will not work with a solo or 2008 - 2012 Harley-Davidson Tallboy&#174; seat.