I did end up figuring it out. The blinker wire on the BRZ is strapped in with all of the wires that feed into the headlight. To find the blinker wire i turned on the blinker and figured out which wire it was with a voltage tester like this:
Once I figured out which one it was I just ran the side marker's blinker wire up to the car's blinker wire and tapped it on. If this didn't make enough sense to visualize I can post up some pictures. Btw, if it were me I'd have just gone with the clear housing swap. The LED conversion required that I cut up some of the old fog light's wiring which will make it really hard for me to ever swap back if I want to, and as it turns out I would like to switch back because I'm really disappointed with the fitment on these iJDMTOY side markers. But Kauf I'm not quite sure what you mean by leaking problems. Overall, not my favorite mod that I've done to this car, but I hope this helps