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I've got an NOS housing if you're interested. $12.50 shipped.
Actually found it lying on top of my 25 mile 78 Pace Car's gas tank when I dropped it.
I'm thinking it was common for the light to get hung up during the body drop. I've seen where a few other's had the same thing as you, one guy actually successfully pulling the light down from above the tank.
Who knows, maybe yours is up there too.