The Kuryakyn 3121 Mount Clamp for Side Mounted License Plate Holder provides a swingarm mount clamp that is required for side mounted license plate installation; cast from quality aluminum. Side mounted license plate provides one of the cleanest and most functional side mount license plate holders available. Smooth design for a hardware-free appearance on the front and back surfaces; no exposed fasteners. Features DOT compliant, ultra-bright LED lighting that lines the entire perimeter for added visibility. Includes (1) gloss black mount clamp assembly and (1) 5/16-18 x 3/4" socket head cap screw (SHCS); suggested for installation (not included): set of hex wrenches. The Kuryakyn 3121 Mount Clamp for Side Mounted License Plate Holder is compatible with Harley-Davidson models: '18-'19 Softail (excludes FXDRS) and custom applications on motorcycles with 1 1/4" diameter swingarms and Yamaha models: '99-'14 Road Stars without swingarm covers (excludes '02-'09 Warrior).