Heater Demister FRUSTRATION!!!

Heres the deal 1973 Duster

Purchased a heater demister control from a member and stupid me didn't specify it was a non A/C car so its wrong.

Purchased a second one from a member non A/C car. Took 3 months to get here and received yesterday. Tried to put it in today and it is still wrong. Screw holes don't line up and the wiring harness plug is different.

Now the one I am looking for is, "and I am only guessing" is the one with this style blower motor switch (pic Attached). This switch plugs into my original harness so hopefully the demister panel that suits will accommmodate this switch.

So in essence I am trying to look for cinderella's shoe. Can you help me