Special rivet with a shoulder used on 1964-87 Chevy & GMC Trucks at the top of the vent window. Years Fit: 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987