These exhaust manifold studs are exact replacements to the originals. Allen head cap screw size is M8 x 1.25 x 25mm. Zinc plated finish for corrosion resistance. Replacement to Polaris part number 7517322. Sold as a set of FOUR. Used on the following Polaris models and more: 2008 RZR 800 2006-08 Ranger 700 (All models) -Also used on the 2016-19 RZR turbo models to mount the turbo.