Drop me a PM & we'll discuss
I should have a few sets of the stock bulb sockets that I can put together with some crimp connectors that will crimp right onto your existing wiring.
The battery terminals are some from one of my parts suppliers. I modded them to handle a couple larger wires. I have a couple more sets of them too.
I have done a couple led modded 3rdBL's with my turn signal mod... here's a LINK
to my 3rdBL pics & videos @ photobucket.
The wiring isn't too complicated, especially for the trucks with 3 bulb tail lights. I haven't tested one with a 2 bulb tail light truck yet, but they should work just the same.
You'll need to tap into both left & right side turn signals wiring to run into the cab, up to the 3rdBL and connect them to the outer red lenses' bulb sockets (or to my modded led 3rdbl wiring).