cutting up 73 dart sport-- really!!!! sawzall!! check it out--

The brackets pictured above. Are these the same as as a 73? These are the plates that go on the firewall to help support the heater core and ac lines. Does anyone have a 73 duster with air to match these up to? I want to buy them but i also want it to be correct. Mine were missing from my car. Thanks for any help. Mike.