I really gotta get on here more often. Nice to see a set of those taillights in the wild they look good!! I just got a set of each for my trucks since I hate the way the lights are stock. The lights are meant to use the blazer bulbs and connectors (I'm guessing brazil trucks use "blazer" wiring harnesses since those are the only ones gm made to support separate bulbs). Since I'm replacing the entire truck harness with a Jimmy harness on my truck the lights are "plug and play" no mods necessary.
How did you wire yours? Did you get a blazer/jimmy 4 pin flasher and run the missing wiring? Or did you splice into what was there. Do your brakes override your hazards if you have them both on?