PTO Link™ SD System - Replacement Shear/Locking Pin & Safety Bolt Combo - PTO Link
Amazon.com: Stainless Steel PTO Square Shaft Locking Trailer Hitch Pin 1/4" x 2-1/4" (Pack of 3) : Automotive
PTO Shaft Locking Pin 1/4" x 2-1/4" ( PACK of 10): Amazon.com: Industrial & Scientific
VEVOR PTO Drive Shaft 1-3/8 in. PTO Driveline Shaft 6 Spline End Round End 39 in. to 55 in. for Bush Hog Series 4 Tractor CDZT4B10004055001V0 - The Home Depot