Climate controls I've basically know how to put it back together?

The climate controls were taken out for some reason by someone else before I got this 1986 SE Royal 4x4 automatic transmission with 360 big block I've basically know how to put it back together but in the back there's these two cooper plates that ate flat and bout 3 inches long with 3 little teeth like things that are on one side of them. My guest I on is where do they go and how to hook them back to the right place to make heater work again because I'm freezing driving this truck.