Grant Tuff Wheel Install

I want to put a tuff wheel into my 70 Swinger, so I picked up a wheel from Classic Industries WHEEL and splurged and bought an A body steering wheel adapter can CAN , and I already have a Grant install kit currently in use with another Grant wheel in my car.
The problem is, I dont see how I can make this can work with this wheel and horn. Two problems..... first, the holes in the wheel are countersunk for screws to go through when mounting, but the can has studs in the correct pattern as the wheel, but they are too large to go through. Second, I dont know how the horn button would be retained using the can.
Has anyone been in this situation with these parts? Am I sending the can back and just using the Grant adapter kit?
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