Leading Edge Lighting Sealed 4" Round Grommet Mount Red Incandescent Stop, Turn and Tail Light, 3 Function Red, round light serves 3 functions: stop, turn, and tail light Sealed, waterproof housing and lens unit, Heavy-duty long-life bulb Shockproof socket guarantees long bulb life, Accepts industry standard, 3-prong plug 4-1/4" Diameter x 2-1/16" deep, Light only, does not include plug or grommet Light will work as an exact replacement for: Uni Bond # SE4000R Wesbar # 423541 Truck Lite # 40282R/40202R Grote # 52922 Peterson # 426R Bargman # 40-01-001 Optronics $ ST45RB