Original OEM GM duct adapter / reducer / transition?.... no part number.  I believe this is correct for the heater duct on the right hand or passenger side of 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 Chevrolet Corvette without a/c.  It is in excellent condition with no cracks or other problems.  Nice addition to any car.

This was recently found with a number of other nice used and NOS Corvette and miscellaneous Chevrolet and GM parts that have been stored for over 30 years.

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