Heater control valve

I have looked and looked and I’m more confused now than when I started. I have a 73 duster 225 slant California car with factory ac. The heater control valve is shot. The one that’s in the car is way different than what is popping up at several different places for replacement. The most common popping up is a four port but says it’s mechanical. What I thought was the original is vacuum valve. At this point I don’t care if it’s not original replacement. Could someone point me in the right direction. Thank you so much for your time reading

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