Look at the exploded view of the coin doors to check, but I think the socket is part 42-0351-00
I don't want to say what the bulb is because I don't know what voltage you are running and don't want to guess. IIRC, the size is T 1-3/4. The Cluster of 3 LEDs happ offers is a nice alternative.
I was able to order them. I hope I ordered the correct bulbs for them. When I look at the bulb closely it has "GE 555" printed on it. I assume this means its lamp #555 which is part # 91-1319-00 (T 3 1/4) ( 6.3V). I also ordered some T 1 3/4 just in case like you mentioned part # 91-1124-00 (6.3V)