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Sorry Al, you are wrong. It's the logo for on the tailgate of the truck. The holes are from the exhaust system for the built in particulate cleaning system that it will have to clean the air from all the coal rollers.
I think we're getting on the right track, now.
It must be the top part of the 16 alternator mounting rack for Model S. Alternatively usable for 8 alternators on Roadster.