Replace your cracked or missing fan shroud with an OER reproduction All fan shrouds will mount correctly to any original GM radiator. Aftermarket reproduction radiators may not include the correct fan shroud mounting brackets which will make itdifficult to install your new fan shroud. All Classic Industries reproduction radiators are manufactured with the correct lower bracketry for fan shroud mounting. Be sure to check your radiator and determine if the fanshroud mounting brackets are correct for your installation. This will eliminate problems which may lead you to believe the fan shroud is incorrect upon installation.For 17" x 20-3/4" raditors only. For 17" x 23" radiator use 3893814.