I should have had another cup of coffee before posting! The LED's in questions are not on the third brake light mount but rather the antenna mount itself. The second picture was supposed to showcase what working Rigid LED's look like.Just an FYI since it looks like you already purchased the new light fixture. BUT for others Diode Dynamics has direct fit LED replacements and I just purchased the cargo & third brake light upgrade as well as the two for the license plate. I picked the middle options and all I can say is WOW what a difference. Very happy and NO re-wiring required.
SEE LINK.
https://www.diodedynamics.com/by-vehicle.html?find=2019-ford-ranger-315314&sid=i1A5dmQvOM