My supplier has the following parts listed for your car:

Spark Plugs - Beru ULTRA X UX79
Spark Plugs - Bosch SILVER WR 7DS
Spark Plugs - Bosch SUPER W 7DC
Spark Plugs - NGK BPR 6ES

Spark Plug Wire Set BOSCH 09023
Spark Plug Wire Set BREMI STI 113A

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