Year:1965-1966 Zinc (clear zinc) Year:1967-1986 Zinc Dichromate (yellow zinc) Description: Fan/Pulley nut & washer Application: Mustang/Shelby Finish: Depends on the year of your car. 1965-66 zinc plated, 1967-86 zinc dichromate Jack’s Comments: This is the correct nut and washer that holds on the fan and pulley for all 1965-86 alternators. Select your cars year from the drop down menu above the green "Add to Shopping Cart" button Related Pictures: More Info or Links: Shipping US: Free UPS Ground or USPS Shipping NON-US: Call or email for an exact shipping quote