This is the universe telling you it's time to upgrade to a nice LED light.
You won't need to constantly feed it expensive bulbs, it won't get to 9,000 degrees, and it'll use about a tenth of the electricity.
Let it go...
These are for a fire truck, run off a genset. I dont have 4-500$ to replace with LED, plus I would want to replace all of them.(x4) They are very well made, I have had no issues with bulbs in the 5 years I have been dealing with them. I broke the wire off the part, so just need the part.
Like I said, looks like I can pirate from a 3$ part I ordered.
Im big into fixing things, not just throwing out and replacing. It looks like a 3$ part will fix it, and extend its service life for another 20 years i am sure. Im not throwing a quality lite away if It can be repaired.