Led Headight Question

You are 100% true but do you always have to be so right?
I'm tryna quit, LOL

as for the headlights by JW Speaker; do you have to buy those lamp adjuster assemblies like Amazon recommends?

Nope. Plug/play without additional parts needed for any of the linked headlamps.

I'm worried about the lights pushing to far forward in my 66' Barracuda if I use them.

The Petersons are the only ones that have a lens that protrudes extra-far forward of the retainer ring. The Truck-Lites and JW Speakers have normal dimensions in this regard.

Even the Trucklite units ( I installed for a client) were so/so. At night the difference between high and low beam seemed very little. I worry about oncoming traffic on a dark night. They did have a very "military" feel when installed in his truck

That sounds like you might be remembering Truck-Lite's first version of a 7" LED headlamp, that looked like this. Not a very good headlamp. Their present lamp is much better, though the JW Speaker is still better.