CURT 56217 Vehicle Side Custom 4 Pin Trailer Wiring Harness, Select Toyota Highlander weld Fits 2 5 16" couplers or lunette seat Fits 2 5 16" couplers or lunette eyes with a 2 1 2" or 3" inside diameter Compatible with any CURT adjustable channel mount Spring loaded locking arm for secure coupling Protected by a highly durable carbide powder coat finish Changeable trailer ball features a hard chrome finish Limited lifetime warranty (one year finish This replacement head for the CURT adjustable tri ball mount #45799 features three different trailer ball sizes to accommodate all standard coupler sizes: 1 7 8" the custom wiring connector uses a single OEM compatible plug and instantly provides a standard It comes with all necessary hardware to establish a solid connection