Premium Oar Lock Socket Insert 5/8 inch to 1/2inch for Kayak Canoe Paddle Board - Walmart.com
Canyon Oar Lock
Amazon.com : Milky Ocean-Oar Locks - Main Shaft Made with 316 Grade Stainless Steel - Easy Clamp-on Design for 1-1/2"(38.1mm) to 1-5/8"(41.5mm) Oars - Fit for 1/2" Oarlock Socket - 2 PCS
Seadog Premium Brass Top Mount Oarlock Sockets - Duckworks Boat Builders Supply