COMPATIBILITY for LEFT HAND: Designed to be compatible with Peterbilt trucks, this left-side tail light bracket is compatible with OEM part number 1606499L COMPATIBILITY for RIGHT HAND: Designed to be compatible with Peterbilt trucks, this right-side tail light bracket is compatible with OEM part number 1606499R DIMENSIONS: Features a 4.5-inch outer diameter for light and grommet mounting, with overall measurements of 7.25 inches length and 2.4 inches width on the mounting surface MOUNTING DESIGN: Accommodates 4-inch circular truck lights with required grommet installation for secure fitting CONSTRUCTION: Durable black bracket with precise mounting holes and sturdy metal construction for long-lasting performance SPECIFICATIONS: Product weighs 2.1 pounds with package dimensions of 11.5 x 9.5 x 3.5 inches for convenient shipping and storage Upgrade your truck's lighting system with this premium tail light bracket from Automann. This robust mounting bracket accommodates 4inch circular truck lights commonly found on semi trucks. The bracket features precise dimensions of 2.400 inches by 7.250 inches on the mounting surface, with carefully engineered mounting points for secure installation. Compatible with OEM part number 1606499L for the left side and 1606499R for the right side, this bracket ensures a perfect fit for your PB truck. The bracket requires a standard 4" grommet (sold separately) for proper light installation. Constructed from durable materials to withstand the demands of heavy-duty trucking. This fits models of 379, 387, 389, 567, 579, 587 Etc.Both of these brackets typically mount to a larger rear tail light bracket OEM# G246000.