Spark Plug Bosch WR-7-DC+ Bosch Super Plus WR.7.DC WR7DC 1367528 WR 7 DC | Pelican Parts
BoschSparkPlugs.net: WR7DC Bosch 7501 Spark Plug - Best Car SparkPlug Replacement
Bosch Super spark plugs WR7DC | eBay
Tiico Bosch WR7DC Spark Plug | Van Cafe
Spark Plug Bosch WR-7-DC+ Bosch Super Plus WR.7.DC WR7DC 1367528 WR 7 DC | Pelican Parts
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