Q: Do you have replacement bulbs for 11-03214? Red or Green
We have added the replacement parts as "Accessories" on this web page. 11-03214 is 14V so the replacement bulb would be 11-04016. This bulb itself is clear. The replacement head assemblies are also listed. They come in red, instrument white, and clear. Note: the clear has a blue-ish tint.
Q: What is the wire length that comes with the connector nut for the light post, part # 11-03205?
The wire length is 35.5".
Q: What is the thread size of the post?
Q: Do you put these in the upper or lower instrument mounting hole, left or right? Will one light illuminate more than one instrument, or is this a one per instrument deal?
As these are accessory lights, there is no specific (regulatory or otherwise) mounting restrictions.