Side lamp housings only, available in brass (and plastic too, if you need one).
The regular plastic "B15F Nav Lamp" set should be procured to obtain lenses and inner mountings; see the instruction sheet for assembly detail. The back board or "screen" can be made from wood- the original was mahogany.
The brass part is easily polished, but both "raw" (unpolished) and pre-polished options are offered here.
Also offered in cast bronze. Bronze is harder/stronger, brass may polish a bit easier. Either should be plated in nickel or nickel+chrome.
Jan 2018: Now offered polished and RHODIUM PLATED- looks just like chrome!