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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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BOSCH spark plug type WR7DC 99917018990 92809460203 99917014190 99917015690 - PC32152 - Mecatechnic.com
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