I was replacing glow plugs in my 2003 F350 Powerstroke Diesel, it has over 135k miles, since replacing glow plugs requires unplugging the injector/glow plug wiring connectors at glow plug side, I was concerned the connector(s) may break , so I decided to replaced the harness with Ford OEM part. The harness was well made and perfect fit , the connectors fit tight, absolutely no movements up/down, or side to side .Great product !