Here can see our choice of custom Harley seats. Many of these seats can be used on any motorcycles and any custom projects. Demon'â„¢s Cycle offers an extensive line of LaRosa leather solo seats for Harley bobbers and other custom motorcycles. This tractor-style seats are made with sturdy polished billet plates and covered with hand stitched and decorated leather. We also carry many Harley seats by Ultima including Softail gel seats and full seats for Harley Sportster. We also have seat springs in different heights and styles.