Sink faucet shower diverter combo??
The lavatory with diverter valve isn't exactly common today, but they are available. My dealer replace mine with one that is very similar to the one offered by Camping World at the following address:
Chrome Finish Lavatory Faucet With Diverter Valve
The description makes it sound like it is possibly better than the one that my dealer installed in my coach as the description mentions brass construction while the one in my coach is all plastic/acrylic.
Good luck with your search!
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)