1958-1974 55-57 and 57-61 with 2 x 4 used a square grommet. The square grommet is part # 271048. Size: N/A
Corvette Central #: 271022
Car years: 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974