Retroguy, attached are the instructions and locating template for the 52 Kaisers (later bumper).
Step 4 on this installation sheet references wiring sheet instructions "included in Wiring Package Part No. 100222" which I have also added.
...and just to further complicate things, the KF Parts Lists for the 52-53 cars list part number 100288 for the back-up lights while the 54 Parts List calls out 100336 as the part number for the 54 cars! I have no idea what the difference is nor do I have a 100336 installation instructions sheet!
However, the attached 52 Kaiser instructions will provide the location template you are looking for.
Hope this helps with your installation in the correct factory recommended location.
Peace.
Mike #4818