I have a 2011 ford ranger and was looking at getting a 3rd brake light with an antenna whip mount so i can route the cable for it under the headliner. All you can see is ones for f150, f250, and f350 and the new rangers. Just trying to see if anyone can tell me that they are the same so i know I'm getting the right one.

 

No, it won't be the same

And you need to watch for international Rangers as well with a 2011 North American Ranger like yours

Ford made a T6 Ranger since 2006 for international markets, never sold in North America...........well until 2019, our "new" Rangers are the same size as the T6
So F-series and the T6 often used similar parts, and that can be confusing
"Fits Ranger, F-150, F-250 and F350" doesn't mean it fits North American Ranger which was smaller 1983 to 2011