Partsam 2x Trailer Truck Side Marker LED Light 2 Diode Red Universal Surface Mount RV Motorhome Partsam (2xRed) 12v DC Side Marker trailer Light Mini-Sealed LED Surface mount design These are universal.Generally people use them as clearance, side marker or identification light. We also get feedbacks form our customers and they use them for trailer lights 2 for brake lights and two for tail light on each side. Also some put them on motorhome as position lights Universal fits for 12V vehicles like Pickups Truck Trailers SUV van Caravan Camper Motorhome Boat Lorry Bus etc. Brightness: 80 lumen each light with 2 pcs High Quality LED Diodes; Easy installation: White wire is the GROUND. Two-wire design includes both lead wire and ground wire for mounting to all surfaces. 64mm x 26mm x 18mm (2.54" x 1.01" x 0.7");the center to center dimension between the screw holes: 46mm (1.8") It all started in the summer of 2013 with a simple, with bold idea: make better auto parts. In other words, not just a better auto parts - a better way of doing things. A new kind of auto company that works hand in hand with users to do something amazing, something meaningful. Now PARTSam has grown tremendously to become one of the leading platforms of e-Commerce in the aftermarket auto parts industry. Inventory Management/Warehouse &amp; Fulfillment  With our warehouse located in Milpitas, California, we take care of the inventory management for our products. This saves manufacturers space, time, and headache. Automated Multi-Channel Sales  We successfully advertise our products on multiple platforms and maintain top-rated healthy seller accounts, which keep customers drawn to our products. We are continually expanding our customer base as we add more sales channels. Professional Seller - Customers will deal directly with us in regards to issues and concerns they experience with the products. Manufacturers will not have to deal directly with the individual customers, but will experience the benefits of their business, which is the typical win-win cooperation. 64mm x 26mm x 18mm (2.54&#034; x 1.01&#034; x 0.7&#034;); the center to center dimension between the screw holes: 46mm (1.8&#034;) Different form many of these lights on markets, Black is Positive &amp; White is Negative/ground Two-wire design includes both lead wire and ground wire for mounting to all surfaces Wires come out of the back of the light