MSC10230 2017-2019 Quad H13 Ford Super Duty 13-Pin Headlight Adapter Boss

Boss Headlight Harness #MSC10230.

This is a 13-pin harness adapter for trucks with 9008 (H13) lights. It is used on 2017-2019 Ford Super duty Trucks with Quad H13 lights not the LED trucks. 

To make sure this is what you need for your truck, check Boss' Power Match.

You can find the installation instructions here.