A couple of options on the wire depending on what you have at the place you plan to interrupt and join. If it is just a continuous wire, in the day Packard dealers would have just done a cut and solder splice and tee'd off for the new accessory. You can do the same today with a 3M or equivalent Quik Tap tee connector. You could position it so as to cover the modern connector with heat shrink tape or maybe fabric loom or something similar to hide it. The one shown is 90 degree tab type but there is also one that is more compact using a bullet type connector for the extra wire or just a splice type with no extra connector needed.
If there is a bullet type or Douglas type connector you can interrupt then there are modern fittings that have a single input and double output that would work nicely and fit the period. If you have the older tab style Wade connectors then AFAIK there is only a single connector or basically a splice fitting available today. A parts car might have some of the older dual and triple Wade connectors you could remove.
I am more curious on your plan to power and would appreciate more info on the bulletin you found. Is it on site here?
Typically the fog lights are a pair and wired in parallel with a single switch turning both on and off. Not following how you can do that by having lights paralleled with the parking lights on each side unless you are going to have them on whenever park lights and headlights are on or plan on using two switches and run the wires back to switches and out again. If you took the power from the parking light terminal at headlight switch and ran to the fog light switch and then out to both lights it would make more sense. Some of the Packard schematics show the power taken from the aux fuse on headlight switch but that is powered all the time. Having them turn off with park or headlights might result in fewer dead batteries.
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