Amazon.com: 4 & 7 Pin Trailer Tow Wiring Harness Plug YC3Z-13A576-CA, Fit for Ford F250 F350 Super Duty 1999 2000 2001 : Automotive
Amazon.com: 55243 7-Pin Vehicle-Side Custom RV Blade Trailer Wiring Harness with Connector for Truck Bed Fit for Ford F250 F350 F450 F550 Super Duty : Automotive
Amazon.com: 55243 7-Pin Vehicle-Side Custom RV Blade Trailer Wiring Harness with Connector for Truck Bed Fit for Ford F250 F350 F450 F550 Super Duty : Automotive
Amazon.com: CURT 57008 7-Foot Vehicle-Side Truck Bed 7-Pin Trailer Wiring Harness Extension, Select Ford F-150, F-250, F-350 Super Duty , black : Automotive
CURT Custom Vehicle-Trailer Wiring Harness, 4-Flat, Select Ford F-150, OEM Tow Package Required, Quick Wire T-Connector 56110 - The Home Depot
For 99-01 Ford F-250 F-350 Super Duty Trailer Tow Wiring Harness 4 & 7 Pin Plug | eBay
Amazon.com: Tekonsha 118243 Tow Harness, 7-Way, Compatable with 1999-2001 Ford F-250 Super Duty, 1999-2001 Ford F-350 Super Duty, 1999-2001 Ford F-450 Super Duty, 1999-2001 Ford F-550 Super Duty : Automotive
CURT Custom Vehicle-Trailer Wiring Harness, 7-Way RV Blade Output, Select Ford F-150, Heritage, F-250, Quick T-Connector 55242 - The Home Depot