This new aftermarket harmonic balancer is compatible/replacement for 1960-67 Galaxie / Starliner / Sunliner / Victoria / Custom / 300 / Country Squire / Country Sedan / Ranch Wagon / LTD with 352 and 390; 1963-64 full-size Mercury 390; 1960-67 Thunderbird 390 2bbl and 4bbl; 1965-67 Fairlane 390, 1967 Mustang 390, and 1967 Cougar 390. Casting number is C4AE-6316-A. 6-19/32-inch diameter, 1-19/32 inches long, single-groove pulley. This is a high-quality aftermarket part. Hollander part number 309-234.