Part Type: Accessory Drive Belt Idler Pulley. Idler / Tensioner Pulley. Pulley Type: Back Idler. Style: Idler / Tensioner Pulley. Pulley Width IN: 1.062 in. Pulley Width MM: 27 mm. Type: Pulley. 2010 Volkswagen Golf Engine: 2.5L L5; 1 Mounting Bolt;.