I think this is the kit you need (left-hand) for the 3500# Torflex axle on recent Trailmanors:
http://www.etrailer.com/Trailer-Brak...er/23-468.html
There's also nut and bolts listed on the bottom of the page.
This is a wonderful upgrade for our trailers. I had no idea these kits existed. They're not listed on Dexter's site, nor does their catalogue mention any 3500# axles with self-adjusting brakes.
But I would ditch the wire-nut and solder (or crimp) the wires together.
Thanks to the OP for this info.