Full White LED Cab Roof Marker Light Assy 3pcs Fit For Silverado, Chevy, GMC etc. Fitment: For Chevrolet | 2007-2021 Silverado 2500HD??3500HD??For these models can be directly replaced,other models drilling and wiring are required?? For GMC | 2007-2021 sierra 2500HD??3500HD Also fit other Chevy or GMC 1500 2500 3500 rooftop (some drilling and wiring required) Specification: Lens color: smoked light color: White Connection mode: Black wire(negative pole) Red wire(positive pole) Led quantity: 6 LEDs in SIDE markers and 12 LEDs in center lamp Waterproof grade: IP68 Service life: more than 50000h .