As shown in the photo indicating #5, this is the duct that acts as a bridge between the distribution duct and the left-hand vent duct. This duct is not in reproduction. 1970-72 Chevelle, El Camino & Monte Carlo.
Everco H1963 Heater Valve 1968-1972 Chevrolet Camaro Chevelle AC NORS
1965 1966 1967 Chevelle AC Blower Motor Resistor Mailbu SS El Camino
70-72 Chevelle A/C LH Driver LAP VENT AC Air Conditioning Malibu Monte Carlo 71
Allstar Performance 57811 Lower Control Arm LH Press In Chevelle
Allstar Performance Lower A-Arm Chevelle LH ALL56321
1964-1972 Chevelle Heater Core Box Fire Wall Seal Gasket No AC 8pc 1965 1966 71