Pushbutton trans

I have a '62, so I'm not positive about the '64, but my pushbuttons pull straight off after removing the instrument cluster bezel, and push right back on again. The type of button is cast into small, raised print in the plastic at the bottom or inside of the button. When you try to insert a known type of button into its correct position with respect to the bezel, there will be only one actuator on the shift mechanism that lines up with it. It might be a good idea to draw a diagram of which actuator each button mates with on the shift mechanism before you remove them. Or take pictures.