I ordered some from PBR. They were the only place that had the original part numbers and they were second hand or "pulled" parts.

You could try the ones in the picture, Adam - they should work. Maybe use a low profile LED ?

Thanks Nino. Perhaps I have another issue with this pop bumper as I have one of these connectors in already and it's not working. As I haven't had this game 100% yet should all pop bumpers be on all of the time or do they need to be lit during game play? I had thought that they were lit when the ball rolled over the corresponding lane switch above them but I'm not sure on this.