Exhaust Manifold Bolt and Spacer Hardware Kit 1998.5-2018 Dodge Ram 5.9L/6.7L Diesel XDP Xtreme Diesel PerformanceThe XDP Exhaust Manifold Bolt and Spacer Hardware Kit XD539 is an ideal add on when you're installing a new exhaust manifold on your truck. Don't risk re using the factory hardware that has seen countless heat cycles, is corroded, and often stripped or rounded off. The XDP exhaust manifold bolt and spacer kit includes high strength grade 10. 9 bolts, and exhaust spacers for a complete installation. Features: Grade 10. 9 Hardware Replaces Broken or