ONLY ONE BULB AVAILABLE. This is a NOS (New Old Stock) GM T-3 6-Volt Sealed Beam Headlamp Bulb for all 7" OD headlight bulbs. It has a three-prong plug-in at the back and is a high/low beam bulb. This bulb had the T-3 triangle in the center, as original. Used on 1940-1955 Chevrolet & GMC cars & trucks. 50/40 Watts. Replaces GM# 193142, 5956006, GE# 6006