This Snap Lock Retainer is used on both the Automatic Transmission Cooling Hoses and Turbocharger Cooling Hoses, if so equipped, it is recommended that these be replaced when the Cooling Hoses are removed from the Radiator, so if you have a Turbo with Auto Transmission, you will need 4-pcs., if you have a Non-Turbo with Auto Transmission, you will need 2-pcs..