Sportsman Series 30 ft. 125-Volt to 250-Volt 50 Amp Marine Type Pigtail Extension Cord - Yellow - Sportsman Generator Cord in the Generator Accessories department at Lowes.com
Generac 6390 50 Amp 50 ft. NEMA 1450 M/Locking CS6364 F Generator Power Cord - Walmart.com
Westinghouse 25 ft. Generator Cord: 50 Amp 120/240-Volt 14-50P to 14-50R 5027825C - The Home Depot
Amazon.com: Generac 6330 10-Foot 50-Amp Generator Cord for Safe and Reliable Power Transfer, Made of Weather Resistant Rubber with Twist-Lock Ends : Patio, Lawn & Garden
Transfer Switch/Generator Power Cord, 50 amp – SMART GENERATORS