1931 S/W Fordor Sedan Dome Light Wiring

[Nelson C]

Our 1931 S/W Fordor has a wood block above the rear window for a Dome Light. (The car was disassembled by the previous owner.) Please help with the following:
1) Does the Repro Dome Light get mounted flush to the wood block with screws from the inside of the light?
2) Does an On/Off Switch get mounted to the passenger side door post?
3) There's a single wire (green) coming out of the reproduction Dome Light. How is the Dome Light wired and grounded?

Thanks very much for your help.