Manufactured by Factory Spec 1 Pair of 1.5 spacers adds 3 total width, makes it easy to widen the stance of your ATV. Provides extra stability and has the ability to accommodate larger tires. Studs are integrated, you do not need to remove the stock studs for installation. Hardware included for easy installation Constructed of 6061 T-6 aluminum for maximum strength and durability These spacers will work with a bolt pattern of 4/156 and the studs have standard threads ***These will not work with metric thread models that have a bolt pattern of 4/156. Please verify your model has standard thread lugs on it before ordering*** The FRONT AND REAR of the following models have a bolt pattern of 4/156 2001 2008 Polaris Sportsman 400 4x4