The Mustang Smooth Driver Backrest Kit with Black Pearl Studs can be used with Harley-Davidson stock or Mustang one-piece seats that have a center opening to accept a backrest The fully adjustable Backrest Kit features black pearl studs on the back side of the 7" H x 12" W backrest Mustang Smooth Driver Backrest Kits are made in the USA Note: this Mustang Driver Backrest Kit will not work with any solo or two-piece seat The Mustang Driver Backrest Kit is also available in plain black 802-189 or with chrome studs 802-191