The A350CN series instrument post light assembly is designed to illuminate the instrument panel and function as instrument mounting bolts. Identical to the A350 Series but with the connector nut.
WARNING: This product can expose you to chemicals including Methylene Chloride, which is known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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.
The wire length is 35.5".
As these are accessory lights, there is no specific (regulatory or otherwise) mounting restrictions.
It would be the length of the threaded section.