[Mad Dog]

I tore my dash apart last fall, and I can't seem to remember how the headlight switch gets replaced. I lost the original bezel, so I ordered a new one....but I'm staring at the new bezel(female threads) and the switch(female threads) and wondering what else is needed. Is there some kind of sleeve that I am missing? I have looked in most of the parts catalog and can't find any parts listed....what am I missing?

It's a 72 Chevt with gauges and factory tach if that makes a difference.