Question about rear lights on a stepside bed

[freco]

The picture shows the rear end of my 1969 stepside bed (please note it's placed upside down!). I have the brackets for the rear lights and one has been mounted to illustrate the position. Now, I wonder how the backup lights with clear glass that usually sit below the red rear lights should be mounted? Is there a separate bracket for the backup lights that's mounted using the two screws below the rear light bracket screws (the screw heads that can be seen in the picture) or is the backup light bracket just made as an extension of the rear light bracket, or something else...? I have looked through the assembly instructions for these trucks but couldn't find anything. A picture of a backup light bracket and how it's mounted would be greatly appreciated!

[ZEKE68]

Backup light bracket bolts to the two bolts that are spaced further apart than the tail light mount holes. The next top two holes in you upside down picture. Separate bracket.

[freco]

Thanks a lot for the quick reply and for also including a picture!
Based on that information I made some new brackets today :-)
The bed is still upside down. Lamps were just mounted quickly for the picture.