Early Louver Tail Light Socket - B.O. Bulb. A perfect and extremely accurate reproduction for all early WWII military vehicles that used the Louvre Lights including Bantam BRC, Ford GP, 1940 Harley WLA, Indian 640, Indian 741, Dodge WC, GMC, Scout Car and many others. Two (2) bulbs required per Tail Light B.O. and one (1) per Tail Light Service.