I have an 1983 hunter '34 and the light fixtures look the same, though your bulbs are different. I ordered two bulbs from the internet. It was inexpensive. The ones I ordered were cool white. I strongly recommend going with warm white for your cabin. I also replaced all my cabin ceiling light bulbs with LED. The replacement ones are brighter and they take a fraction of the electricity of the halogen bulbs. Cabin lights are warm white and I prefer that look/feel. When I get around to replacing the reading lights with all LED (I only use the ones I have put bulbs into), it will be warm white, including the two cool whites.
I recall when I put the bulbs in that they originally didn't quite fit and I had to use a file to take a bit of the flared out metal part of the bulb down. That was two years ago and they are working fine since (except for that rather surgical feel of cool white).