Edelbrock Part #15039 Tensioner Upgrade Kit is engineered to handle the increased belt stress encountered in high horsepower Edelbrock applications. This kit is an upgrade for part #1573, #1576, #1592 & #1595 Edelbrock Supercharger Systems produced prior Product Features:Belt IncludedSpecific FitTensioner IncludedUpgrade for Part #1573, 1576, 1592, 1595Mounting Hardware Included