Reproduction Ford small block 2-1/2" fan spacer for 1964-73 Mustang models. The spacer is designed to mount between the fan and the water pump pulley. Each fan spacer is manufactured in aluminum. Authentic original appearance for use with 2 or 3 row radiators. Mounting hardware is included. Also used for use with 3 or 4 row radiator conversions. OE part number # C4AZ-8546-A.