Mercury - Sterndrive Installation Hardware Kit MerCruiser Series Stainless Steel Fasteners 859116Q01. Overview. When you are working on a MerCruiser sterndrive, the small details matter just as much as the big components. Hardware might seem simple, but seasoned boaters know the wrong fasteners can cause headaches down the road. The 859116Q01 hardware kit brings the peace of mind that comes from using components designed for your drive - clean threads, proper fit, and the kind of reliability you