NISformance polyurethane side mount inserts. We are excited to offer high quality, Performance polyurethane mount inserts for the 2000-2003 Maxima, 2002-2006 Altima and 2004-2006 Maxima.Our mount inserts are made using 62A hardness, high performance polyurethane. These are softer than our front and rear mount inserts to help keep vibrations to a minimum. This offers the perfect level of support without the added harshness that is present with a Delrin or Solid mount insert. Our inserts are perfect for anything from a street driven vehicle to full blown track cars.Please note that only the transmission side mount insert is compatible with the 2002-2006 Altima (3.5) and 2004-2006 Maxima. The passenger side mount insert will only work with the 2000-2003 Maxima.Why Polyurethane?Polyurethane is available in many different levels of hardness to fit different needs and applications. Our 62A shore hardness polyurethane mount inserts offer the perfect amount of support without the harsh vibrations and rattles that accompany Delrin or Solid inserts.