The Yakima replacement parts kit you referenced, their Replacement Hitch Bolt, Nut & Clip for BigHorn 4 Bike Carrier # Y8780022, includes parts required to secure any of a number of their different hitch-mount bike carriers to the 2-inch hitch receiver on a vehicle.
The Yakima racks this kit works with are listed on the product page, and they include several current and even discontinued items. view full answer...