Those hubs were custom designed for those manufacturer prebuilt wheelsets. Those wheelsets are quite vintage and quite hard to come by these days (they cost a lot when new and therefore not so many people were available to afford them). Worse, is due to the fixed gear hype, people are willing to overpay/ overcharge more for them despite their age.

Not sure about the 1st bike's shimano wheelset but I know for sure the the cannondale track below it has campagnolo shamals from the late 80's/ early 90's.