Road & Home 2-in Silver Hitch Pin/Clip in the Specialty Fasteners & Fastener Kits department at Lowes.com
Amazon.com: Goreks Trailer Hitch Pin and Clip, 1/2-Inch Diameter Heavy Duty Bolt Mount Hitch Pin, Designed to Fit for Class I and II Receiver Tubes | Features Durable Rust Resistant Finish :
TowSmart Standard 1/2 in. Steel Bent Hitch Pin with Clip - Fits 1-1/4 in. x 1-1/4 in. Hitch Receivers 731M - The Home Depot
Reese 5/8-in Hitch Pin with Swivel in the Trailer Parts & Accessories department at Lowes.com