???? ELRING 335.350 INJECTOR SEAL RING (UPPER) • WITH FLANGE • HONDA 1.7 CTDi / OPEL VAUXHALL 1.7 CDTI (Y17DT/Y17DTL/Z17DTH). Typically,4 seals are required per engine. Specific to1.7 diesel engines found in Honda Civic VII 1.7 CTDi and Opel/Vauxhall 1.7 CDTI (Isuzu-based engines).