Heater Contols

While piecing my 70 Dart together, I installed a complete dash from a later model Duster. I ended up with with a heater box with 3 flap arms protruding out of the top box, and a control panel that accommodates only two cables. Is there a mechanism that will adapt this, or do I have to search for the correct cable control panel? (My original dash was missing parts, & pretty messed up).