How to remove sliding heater and air conditioner controls.

I should have mentioned that the picture of the inside of the dash panel is actually a 72 with the tangs from a 73 JB welded in. The 73 hole for the hvac controls is a bit larger than the 72. To refinish the dash panel woodgrain, I would use the decals from Detroit Gasket. They fit well and have a nice appearance.
Ok. Thanks for your help!