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.