Required for installation of H-D^® Detachables^™ windshields on '88-later XL (except XL1200CX, XL1200X, XL1200XS, XR1200, XR1200X, and '11-later XL1200C) and '91-'05 Dyna^® (except FXDWG and FXDXT) models. XL and Dyna^® models with front turn signals originally located on the upper triple clamp may require the additional purchase of Turn Signal Wiring Kit P/N 72389-96.