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 :
Hitch Pin 5/8" (ZINC) - Agency6.com
Everbilt 1/4 in. Zinc-Plated External Hitch Pin (2-Pieces) 25238 - The Home Depot | Zinc plating, Zinc, Hitch accessories
Hitch Pin Clip 1/8" (.13") x 2-9/16"
INCREWAY Hair Pin Clips, 10 Pack 5/32 x 2-15/16-Inch Spring Steel Zinc Plated R Clips Cotter Pin Hitch Pin (M4×75mm): Amazon.com: Industrial & Scientific