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Bosch WR7DC
Spark plug Bosch WR7DC for 520/4+520i all years of manufacturing, you need 4 for 1 car and for 525+528 up to 08/1976, you need 6 for 1 car | Wallothesch
BoschSparkPlugs.net: WR7DC Bosch 7501 Spark Plug - Best Car SparkPlug Replacement