I am wanting to install lights in the bumper of my XJ. About 3" to 3 1/2" light. I have seen it a couple of times like that. I am not sure how to mount them. I would like to get some ideas (pictures) of what both inside and outside of the bumper would look like.

 

Could weld tabs on the inside of the bumper.
May want to get to it before you get flammed for putting this in fab

 

Moved to chat

 

For such a small size for a decent light your options would be a Piaa 510 (4") , Light force 140's or a LED light like a Rigid Dually or D2

 

You could buy a light bar like this http://www.detoursusa.com/bumperbrow.php