The Hobbs brand lights I bought have the hollow stud for a mount. My CaseIH dealer carries many sizes and styles of the Hobbs lights. They are not the cheapest but looked to be one of the best quality.
They also have larger lenses compared to other brands. As an example, their 4x6 light is almost the full 4x6 size. One brand I compared it to had a 3x5 lens with 1/2 of plastic all around it so they called it a 4x6. The light quality is excellent on my Hobbs.