There is definitely some detective work to be done on these bikes, since the seller doesn't seem to know anything about them.
The Rambouillet looks off, but in a way I think I can guess at explaining. Ram's were by definition 700c bikes with medium reach brakes and fit 700x32 tires or thereabouts. This one has very chubby tires and long reach brakes with pads at the very ends of the slots. That makes me suspect that is a 650B converted Ram. Rams came in even cm sizes, and that head tube height makes me guess it is maybe a 62cm. It's maybe a 60cm, Almost definitely not a 58.
Assuming the orange Rivendell Custom is around the same size, those are probably 26" wheels. That's my guess
The dark grey cantilever Hilsen is sort of off-menu, because it has cantilevers. The wheels also look smallish. My guess is that was actually the largest Canti-'Luki (Saluki), which would have been a 62cm. Then, when the owner wanted a repaint, the Saluki decals weren't around, but Hilsen ones were. The Saluki became the 650B Hilsen around 2010.
Those are lovely lovely bikes.
Bill Lindsay
El Cerrito, CA