Jag,
Well I would have thought you could buy these at a local hardware store, but I have searched the internet under every name I could think of and cant find anything that resembles the insulators I have seen before. They are usually square with the center of each side of the square coated in a plastic or rubber. You remove the bulb from the housing, insert the male end of the bulb into the square and reinsert into the housing. Sorry I cant not be any more help on this at the moment :-(
Also I thought of something else that might be easier to obtain. When you purchase outdoor floodlights there is usually a piece of fire resistant cloth or something similar wrapped around the male end of the bulb. (Looks like a thin disc that the bulb has been inserted into) This piece of material keeps moisture from getting near the metal socket. It may also keep the bulb from vibrating.
Again, sorry I cant find the other item, I will look more after work tomorrow.
