Bolt Depot - Hitch pin clips, Zinc plated steel, 0.080 wire diameter, 1/4 to 3/8 (1-3/16 length)
Everbilt 3/16 in. Zinc-Plated Hitch Pins Clips (2-Piece) 809588 - The Home Depot
CURT 21500 Trailer Hitch Pin & Clip, 5/8-Inch Diameter, Fits 2-Inch Receiver : Automotive
3/32 X 1-5/8 Zinc Plated Hitch Pins (Pack of 12) : Automotive
Everbilt 3/8 in. x 2-1/8 in. Zinc-Plated Cotterless Hitch Pin 815618 - The Home Depot
Hitch Pins at Tractor Supply Co.
Hard-to-Find Fastener 014973222222 Hitch Pin Clips, 3/16 x 3-1/4, Piece-50 : Industrial & Scientific
Cotter Pin - Hardware - The Home Depot
Everbilt 3/8 in. x 2-1/8 in. Zinc-Plated Cotterless Hitch Pin 815618 - The Home Depot
Everbilt 5/16 in. Zinc-Plated Hitch Pin Clip (2-Piece) 809618 - The Home Depot
D Clips – rackitinc
Reese Towpower 7033100 Class V Zinc Finish Pin and Clip , Black : Automotive
Everbilt 5/16 in. Zinc-Plated Hitch Pin Clip (2-Piece) 809618 - The Home Depot
Everbilt 3/16 in. x 2-1/2 in. Zinc-Plated Cotter Pins (3-Pieces) 816408 - The Home Depot