Primarily Petroliana Shop Talk Forums Thread Like Summary - What is the light topper called on this red shade?

I’m looking for a light topper like this stop the red shade? What are they typically called?

Thanks

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The brand of aluminum vintage spotlight is called a Pemco. They can be found on eBay.
Not sure of the exact lamp(bulb) it takes, but guessing a PAR in a narrow beam angle.