Mustang One-Piece Squareback Seat For Harley Breakout The Mustang Squareback Seat for Harley Breakout delivers an updated style to a classic look. A low-cut 11.5 driver bucket rises to meet the squared off passenger section, offering good back support. The generous 8.5 width of the passenger section gives great support for two up riding while maintaining a sporty look. The hand-sewn cover features a Tuck and Roll pattern in front with carbon fiber accents in the driver area and the rear. Features: 11.5 wide bucketed rider area provides excellent support in a low-profile, sporty package. 8.5 wide passenger sections offer comfortable 2-up riding. Handsewn cover with Tuck and Roll pattern and carbon fiber accents made from marine-grade expanded vinyl Mustangs proprietary controlled-density foam formula requires no break-in and retains shape and support after years of use Marine-grade fiberglass baseplate for long-lasting support and durability, with polyurethane bumpers to absorb vibration