For over 100 years, professional technicians have trusted Standard to replace the failed OE part. Standard manufacturers the highest-quality, best-performing parts for all import and domestic vehicles; gas, diesel, electric and hybrid. Precision manufacturing, multiple layers of testing, and a detailed validation process ensures Standard parts don't just fit, they perform and they last. Hardware included: Yes Gaskets Included: Yes O-Rings Included: Yes Buyers Guide: Chevrolet Silverado 2500 HD (19-17) Chevrolet Silverado 3500 HD (19-17) GMC Sierra 2500 HD (19-17) GMC Sierra 3500 HD (19-17)