Special steel clamps that hold both halves of the heater box together on both A/C and non A/C Cougars and Mustangs. Two versions found, round and flat, like in the comparison with reproduction. Sold individually. This taller or round clip is slightly easier to clip onto the boxes.
Replaces part #: C0DF-19A779-A.
*NOTE* Never pry these off or the lip they attach to will lose the edge and it will be hard to fasten the clips back in place. They are designed to come off by inserting a standard screw driver in one of the ends and flexing the clamp to open the jaws.