Your Corvette differential is nothing to play around with. Even small details make a big difference when it comes to servicing or rebuilding your rear end assembly. Even small details like the drain plug matter. Make sure you choose the right drain plug for the job. Eckler???s Corvette offers a stainless steel differential drain plug designed for use with 65-79 Corvettes. The plug features coarse threads and is made from durable stainless steel. Fits: 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979 1965-79 Differentail Drain Plug