THIS VALVE SPRING SEAT IS USED FOR TWO (2) DIFFERENT PURPOSES WITH VALVE SPRING (251262R2):
1) AS ORIGINALLY CONFIGURED IN A C60 ENGINE FOR THE VALVE SPRINGS FOR THE INTAKE VALVES OR;
2) WHEN THE EXHAUST VALVE SPRINGS (357168R1) ARE REPLACED WITH VALVE SPRINGS (251262R2) AS A SUBSTI..