defroster vents

The repro ones must all be off a bit. Mine did not fit either. I had my dash out so I just enlarged the holes a little.
The radio is easy to get out. Just remove the knobs and the nut behind them. Next unplug the wires and remove the brace on the back. The radio should slide out and down from the back. If you have under dash AC vents they will need to be removed most likely.