Fuel Tank Filler Neck1964-1966 Ford Mustang2 1/4 (.250) in. Inlet11 1/2 (.500) in. Overall LengthSteelGrey Powder Coated FinishSold Individually JEGS 78758 Fuel Tank Filler NeckJEGS 78758 is a direct replacement fuel tank filler neck for a 1964-1966 Ford Mustang. Made to exceed OE standards and grey powder coated to inhibit rust, it is a perfect replacement for your worn, leaking, or rusted stock filler neck.