Our 1965-1969 Mustang Heater Plenum Chamber is made of high temperature injection molded ABS plastic with insulated metal air deflector (to eliminate rattles) and predrilled mounting holes. The original Mustang Heater Plenums were made from a pressed board that deteriorated and warp when exposed to liquid. They are also often torn. Our plenum champers are go through injection molded process for a precise fit. 1964 - 1966 all, 1967 - 1968 without AC.
(1) Cable clamp
Proudly Manufactured in the USA by CPC