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
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6 Spark plugs WR7DC
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Amazon.com: Bosch WR7DC (+1) - Spark Plugs Nickel - Set of 4 : Everything Else
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Spark Plug Bosch WR-7-DC+ Bosch Super Plus WR.7.DC WR7DC 1367528 WR 7 DC | Pelican Parts