I know of no state that requires a retrofit of a third brake light to any vehicle not originally equipped with one.
Therefore, I seriously doubt there are any requirements for the placement of a third brake light on vehicles that never had one to begin with? How could they even enforce such a rule if one existed? Every vehicle is different and it would be impossible to set a height requirement in the first place.
Look at new cars. None of the third brake lights are in the same location or height from one vehicle to the next.
Last edited by Otto Skorzeny; 08/26/2022 6:17 PM.