I actually just replaced the head only, and yes, I was able to find a new head only online. The old one twisted off, and the new one screwed onto the hose perfectly, and that was great. But in a few years, I doubt I'll be as lucky again, as spare parts dwindle, so I want to be proactive, by knowing what I can replace the whole thing with, so that it'll fit into the sink pedestal and work as Airstream intended the bathroom to function.
But if it has to be a "regular" little sink faucet, with a shunt to a spray head, so be it.
(And I saved the old head, just in case...)