That AA photo shows two Beseler 4x5 enlargers with a 4x5 point light source on the shelf. That's the only Beseler Point Light Source I know about. It was made for the CB7 which has 7" condensers, but will fit on the 4x5 enlargers (6.5" condensers) with "washers". I have two of them right now, and I only need one. For some reason, even though they are rare, they keep falling into my lap. I've sold two in the last few years.
The unit height is adjustable, and the 12v light bulb can be moved left-right & forward-back to get it right in the middle of the condensers.