Take NOTE: Polaris has a confusing system for their models. They call all models a 155″ which can either be the 154 with 2.86″ pitch or the 156 with 3.00″ pitch. They also do the same with the 163″ which can be the 163 with 2.86″ pitch or the 162 with 3.00′ pitch. Be sure you get the correct pitch for your model.