OEM Number of Serpentine Tensioner: 11955-JA10D, 11955-JA10A, 11955-JA10B, 11955-JA10C, 11955-JA60A, 11955-JA10DFitment of Automatic Belt Drive Tensioner: for Nissan Altima SE, SL 3.5L V6 - Gas 2007-2009 for Nissan Altima SR 3.5L V6 - Gas 2010-2012 for Nissan Maxima S, SV 3.5L V6 - Gas 2009-2014 for Nissan Murano LE, S, SL 3.5L V6 - Gas 2009-2010 for Nissan Murano Cross, LE, S, SL, SV 3.5L V6 - Gas 2011-2014 for Nissan Quest LE, S, SL, SV 3.5L V6 - Gas 2011-2013 Specification of Belt Tensioner and Pulley Assembly: Color: Silver Tone, Black Material: Metal Total Size: 10.4x9.8cm / 4.09''x3.86''(L*W) Hole Diameter: 8.3mm / 0.33'', 8.5mm / 0.33'' Include 1 x Accessory Drive Belt Tensioner Assembly. Feature of Belt Tensioner w/ Pulley: Replace the old or broken belt tensioner to avoid noisy tensioner pulleys and no longer withstand belt noise. Achieve proper belt tension, and alignment, and ensure the good performance. Torsional round spring provides reliability and consistent tension Take the tension off and pull the pin out after getting the belt in position. The tension force is automatically adjusted to make the transmission system stable due to the different tightness of the belt. Solid metal for wear resistance, not easy to break or deform, ensures longer service life. Please allow slight dimension differences due to different manual measurements. This is a non-OEM product, accessory only!