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I replaced the door handles using the 63-65 reproduction handles. I used the button and hardware from a '61 Falcon parts car because my buttons were either broke or bent. The '61 push-pin is thicker in diameter than the '60 push-pin.
Instead of drilling another hole next to the hole as suggested I used a Dremel to cut a slot for the locating tab to slide into since it's only off by a half of a hole. When it came time to install the retainer I notice the retainer attaching screw was too small for the reproduction handle. Luckily I happen to have an old set of Maverick door handles to rob the correct size screws and thin 0-rings. I had to drill the retainer screw hole a bit larger.
When it came time to install the handles to the body I notice the screws wouldn't turn but one or two turns. I chased the threads with a tap to clean up the threads in the handle to get the screws to tighten.