Description Reviews MINI Cooper S N14 Injector Seal ~ From start to Build date 05/09 on by Bosch #13-53-7-573-801. This is a must have seal when repairing a head on the Gen 2 cars. Sold as each, you will need 4 units to do all 4 injectors. Note: You need a special tool to install this seal. We offer a rental here.