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used but serviceable electrical portions are available. Pretty sure I still have a couple on hand. I believe Wilkinson is selling replacement lock tumblers with keys. But the actual housing that clamps onto the steering column is a difficult piece to find.
The assembly is a four terminal unit, (power, accessory, run, and start) which can be functionally replaced with a standard universal ignition switch, such as this:
of course, this would need a custom mounting bracket, and cannot serve as a column lock. But it could serve its purpose until a correct unit is located.
Larry