The adapter is called a "Kenny Kustom". I just cut it out of some 3/16" (I think) iron stock and cut the hole with a bi-metal hole saw, drilled holes for the bolts, and did lots of grinding to clean it up.
It's basically a thin version of the adapter that came with the car. It was more like 5/8" think and had a vacuum port. Some have the ones that the heater hose hooks to for cold weather driving.
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