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 7518234. Sold as a set of FOUR. Used on the following models: 2005 Sportsman 600 2005-08 Sportsman 700 (Including X2) 2007 Sportsman 800 (Does not fit dual exhaust models) 2008 Sportsman 800 Touring 2007-08 Sportsman 800 X2 2005 Ranger 700 XP