Amazon.com: CARROFIX Trailer Wire Extension - 4 Way to 5 Way Flat Harness - Universal Adapter Connector 4 Pin to 5 Pin for Connecting Signal Lights from Truck to Boat Trailer and
Amazon.com: True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] [SAE J1128 Rated] [25' Male & 4' Female] [18 AWG Color Coded Wires] 4 Way Flat 5 Wire Harness for