I found these fixtures at a marine supply in their discontinued stock list online. The fixtures are not an Airstream exclusive item and are quite common in boats. Check a West Marine Supply, I would guess they can get them.
Halogen bulbs are EXPENSIVE, but I have found great deals on these bulbs in garden supply stores that are discontinuing them - less than a buck each. i also use the 5W in the fixtures in my cabinets in my CCD - cooler and less power usage.
Michael & Tina with Layla and Preston BZ
The family has grown.
2003 22' INTERNATIONAL CCD