How does the steering column mount?

I have an all original, numbers matching, 1969 Formula S, 383, four speed Barracuda. When I bought it, some parts had been removed. They were all there and came with the car but I did not get to see the steering column mounted in the car. It has a plate attached permanently to it and the plate has 3 holes about the size of a quarter. Obviously a standard bolt won't work.
My question is, does anyone know what kind of hardware is used to attach the steering column to the firewall and do...

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