I need a fuel injector for a 1993 300z non-turbo. NAPA heve sent my mechanic two that didn't fit. Unfortunately its not the original motor so I am in a fix. The injector has a dark red plug with a male guide lug on the bottom just off center. Can someone tell me if NAPA is screwing up, or I have an engine from a different model car? Nearest Nissan dealer is 50 miles away.