My Ranger did not have a cargo light, to make this one work, I had to add a wire to the harness. Then I ran the other end across the underside of the headliner and finally to the dome light. There I used a red stakeon to put it under the interior dome light hot feed screw, it seems to work well. The foot print of the light is the same as my OEM one. The gasket will squish so that you get a perfect fit. The break light works as it did, cargo comes on with dome. To add to the harness, and avoid splicing you factory harness, you will need the small connector for your wire that will snap into the factory connector. I got lucky and happened to have one that fit.