Relocating HVAC controls

[tommy583]

I'm installing a double din gps unit in my car. I will be moving the HVAC controls to the bottom spot. I had no problems moving the wires to the lower spot. But I can't seem to get the HVAC controller to fit. It won't go all the way in. It sticks out about a half inch. Do I have to trim something on the controller or inside of the mounting hole? I thought it would just slide in. I can see where the little tabs on the bottom should go and the holes to screw it in on the top sides. It seems to be hanging up on something inside that I can't see.