I bought the H9DC and will change the plugs in the next couple of days. My supplier told me that they sell the H9DC all the time and they only had 5 H9DC0 plugs in stock and also mentioned that the last time they sold the H9DC0 was 2 years ago.

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz