Ducati Performance Single-Seater Cushion Spacer748422111 Short Description Product Instructions For use in a single seater configuration, this practical spacer was designed and developed to be installed behind the cushion. With this solution, the customer can choose whichever size they prefer. The package includes 2 spacers, made of the same material, which allow 20mm and 40mm to be added to the original configuration, in order to ensure that we are always ready to meet the customer's every need.