1、OE Number: The referencing OE number of this all lamps module is ALO 37, which is molded and designed depend on the original data. 2、Fitment: The all the lamps on module is a replacement for 2003 to 2007, please check the model and year before ordering. 3、Main Function: Control high beams, low beams, fog lamps and day time running light to be on simultaneously when turn on high beams. Greatly improve illumination at night. 4、Durable Construction: The all the lamps on module is made of high performance PCB Materials, which is solid in construction, durable and much safer to use. 5、Easy Install: Find your fuse box, pull out 4 relays labeled Fog Lp, Hdlp Low, Hdlp Hi, Drl. Lay down the circuit board and reinstall those relays back into original location. No modification to existing wiring. Item Type: All The Lamps On Module OE Number: ALO 37 Material: PCB Fitment: Fits for 1500/2500 HD 2003-2007, for 3500 2003-2006, for 2500 2003-2004, for 1500 HD 2005-2006, for 1500 Classic/1500 HD Classic/2500 HD Classic/3500 Classic/3500 HD 2007, for 1500 HD 2003 Replacement for 1500/2500 2003-2006, for 1500 HD 2003, for 1500 Classic/ HD Classic 2007, for 2500 HD Classic 2007, for 3500 Classic/3500 HD 2007 Fits for 2004-2006, for EXT 2003-2006 Fits for GMT800 GMT 800 trucks 2003–2007 1 x All The Lamps On Module