Yes, the same part was used on Corvette convertibles of that era. The same company, ASC, did the conversions.
The bulbs can be replaced with low-voltage lighting kit bulbs from the hardware store. 12v bi-pin xenon bulbs, I do not recall the wattage, 20 watt is probably OK. They can be bought from Amazon, $7 shipped for a six pack.
I think these are correct:
http://www.amazon.com/Halogen-Light-Bulbs-...e/dp/B000WBGDZS
You could build up the pins on the bulbs with some solder, that might sort out your socket looseness. Wrap with a fine gauge copper wire if need be and then wick in the solder. You could also wire in a mess of LEDs.