Bill Brackemyer
Member
I'm working on a 1959 Oliver 770 at work. Trying to get the lights wired back up which is pretty easy. The problem I'm having is locating replacement headlamp bulbs. The lights are Guide units which have a sealed beam bulb in them retained with a trim ring. The O.D. of the bulb is 4 3/4 inches. Yes, I typed that right 4 3/4 inches. They have two screw terminals. A single post right in the middle is the positive and the negative terminal is on the edge and also doubles as the tab which keeps the bulb from rotating in the housing. Anyone know of a replacement. As far as I know, these are the original lights.