Our are the # 1 source of new and remanufactured injectors for Detroit Diesel 4-71 turbo engines. The easiest way to identify a replacement injector for your engine is look at the circular plate that is right on the injector itself. The plate would have 2 to 4 digit number that may start with a letter. It would something like N55, N65, N70, N90 or other . This will allow you to buy the right injector for your Detroit 4-71 error free. All parts ship within 24hrs of order. We ship worldwide.