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
Bosch Super spark plugs WR7DC | eBay
Amazon.com: Bosch WR7DC (+1) - Spark Plugs Nickel - Set of 4 : Everything Else
TORCH F6RTC 131-039 Spark Plug Replace for NGK BPR6ES for Bosch WR6DC WR7DC | eBay
Amazon.com: TORCH 4pcs F6RTCU U-shaped Groove Spark Plug Replace for N GK 7822/BPR6ES, for BOSCH 995/WR6DC 7900/WR7DC, for Cham pion RN9YC RN10YC, for DENSO W20EPR-U, MTD 951-10292 751-10292 Torch Engine 131-039 :
LINDSEY RACING - Your Porsche Performance Parts Center: BOSCH WR7DC SPARK PLUG - SPBOSCHWR7DC
Tiico Bosch WR7DC Spark Plug | Van Cafe
Spark Plug Bosch WR7DC :: Custom & Speed Parts (CSP)