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That asbestos sheet may have had aluminum bonded to it. Some of the 40's -50's light fixtures (think drum-shape here) had this so the lamps would not radiate the heat up into the canopy, where house wiring is rated for only 60 C degrees. There is nothing under that chassis that heats up enough anyway.
I seriously doubt you need heat shielding, so you can remove it. A carefully-cut sheet of thin steel, slightly larger than than the chassis footprint is an option to provide shielding, which you also may not even need..
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