DJ ROCK GASKETS/ENG is the manufacturer of engine components, specifically oil pumps, and is associated with the brand DNJ Engine Components. They are a full-line provider of both Domestic and Japanese engine parts for cars and trucks. DNJ has a 30+ year history of quality, experience, and customer trust. The specific product mentioned, the OP607 oil pump, is designed for 1989-2004 Nissan 240SX, D21, and Frontier 2.4L L4 16V DOHC 2389cc engines.