Mustang Motorcycle seats for Harley Davidson Dyna. Vintage, studded, and more. Mustang is well know for their quality Harley seats. For great comfort and styling, Mustang motorcycle seats designed for your Harley Davidson Dyna.  These popular pillow seats feature a split foam construction on a single baseplate.  This maximizes the driver back support and keeps the passenger from sliding forward. Buy Mustang motorcycle seats at Cli-MAX Riding Gear - Free Shipping Available.