This harness fits ’06 and Early ’07 Isuzu NPR and NPR HD as well as GMC W3500 and W4500 trucks. This harness has an extra plug. Your harness may or may not have this extra plug.   Please specify which harness you need; dash/cab, engine or chassis.   Call for pricing and availability at 1-877-564-6307 Press 1.  If you have any further questions speak with our sales team. 05-04-16 *Pictures are for Illustration Purposes Only*