Spark Plug - Bosch WR-9-DC (7911) NGK BPR5ES (7734) for 280CE (1978-1981), 280E (1977-1981), 280SE (1977-1980), 380SE (1984-1985), 380SEC (1982-1983), 380SEL (1981-1983), 380SL (1981-1985), 380SLC (1981), 420SEL (1986-1991), 450SE (1976), 450SEL (1978-1979), 450SL (1976-1980), 450SLC (1976-1980), 500SEC (1984-1985), 500SEL (1984-1985), 560SEC (1986-1991), 560SEL (1986-1991), 560SL (1986-1989)