Sounds vaguely familiar and something that came from a real local plumbing supply. You are more likely to find replacement parts there (even if you can't seem to find them online).

You could try this: take off one of the handles, then take it to the store and try matching up the depth and size of the connection. It might be fairly standard (whereas changing stems is definitely not the case).

Same for the spout. Figure out how to remove it (It will either unscrew, or there will be a hole and a set screw underneath near the wall, and then it slips off.)

Take a look, and maybe even give them a call:

http://www.centralbrass.com/