Since I am now an old man, I constantly "fiddle" with stuff; I am too old for real "projects". So, I started fitting and measuring things on the back of the truck and figured out a way to install a couple of work lights without any modifications to the truck; just make a couple of brackets and bolt them on using existing holes and fasteners.
Below are the pictures of the parts and the finished installation on the truck for anyone that is interested. I haven't wired it yet, I have to build the switch bracket for under the dashboard. I have the waterproof switch (Saturn Surplus has new, waterproof switches with Packard connectors) and I'll order the wiring from Vintage Wiring of Maine after I make the measurements for the wire lengths. I'll use Packard splitters to hook into the light circuit for power.
These may look like reverse lights / back up lights to some people, but in my state there is a very strict definition of back up or reverse lights. These do not meet that definition so they are "rear work lights". If I called these "back up or reverse lights" I would get a citation and have to remove them; if they are ALWAYS referred to as "rear work lights" there is no violation. Ah... the wonderful "Alice in Wonderland" world of legal semantics.

So, after that wall of words, here's the photos:
This is the original bracket I started with; it is 3/16th material.

Here it is after I corrected most of my initial design errors.


Here are a couple of photos of the light assemblies. They were not originally 24087 O.D.; I painted them to match the truck.


Here are some photos of the light assemblies attached to the bracket.




And finally, here are some photos of the "work lights" attached to the back of the truck. They are attached to the lower, inboard bumpette bolt hole using the existing fasteners. These lights are easily removed if a purist acquires the truck after I'm on the other side of the dirt. I think they they blend in well and look "period correct" even though they are not.

