You need something like this but a closer view of both plugs. Which one is the one you need? Looks like you need the plug on the left.
Pic was stolen off Dwaynes website
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**