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Relay 84-89 Rear Hatch Window Power Release / 74-89 Horn Relay. Electrical components such as switches, regulators, relays and horns, etc. are Non-returnable parts.Always refer to a factory service manual when diagnosing engine service problems. You can damage electrical components if the proper procedures are not followed. Be sure you are replacing the correct part. Size: N/A Corvette Central #: 593088 Original GM #: 344813 Car years: 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989