C3 corvette side vents Top Contributors this Month View All. 1968-1977 Deflector Assembly, right lower air conditioning duct outlet. Need to replace it with a new one. Photos . The 70, while looking the same on the outside then the 71 and 72, are differant on the inside. Item ID: 642-172. Find C3 Corvette 1973 to 1977 heating and AC parts at Volunteer Vette Products. C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette. . ) $ 299. femwltleribquubgayaevrdcmqqoyhveugieropgesyosqkylivvptrrmbqzsduutamlxjnxv