What is it?

[spankster]

Car is a 70 Dart

 

[64mopar]

Parking brake cable clamp under the dash?

 

[missing linc]

Can you post some pics from different angles?

 

[ragtopfury]

Clamp/clip that holds the control cables to the heater box?

 

[Dana67Dart]

Clamp/clip that holds the control cables to the heater box

Ding ding ding

 

[spankster]

Thanks! Its the heater box cable.