First time actually posting on a forum,if anyone knows a similar post that has been answered pls direct me to it!

02 525i e39 with cd business Hu (non dsp/Navi)
So my goal is to add a JBL gtx500 mono aftermarket amp and a 12” sub into the boot without changing any speakers & Hu , just keeping everything stock.

After looking up online and watching the bavsound e39 non dsp amp install tutorial on YT, I will be using the LOC method. I have a scoshe brand loc called loc2sl with 7 wires

White: left front positive input
White/gray: left front negative input
Gray: right front positive input
Gray/black: right front negative input
Yellow: +12 volt power input
(Constant power)
Black: ground
Blue/white: +12v remote output http://bjzhjy.net/scosche-wiring-dia...ly-loc2sl-1-5/

My question is what harness pin(12 or 26) from the stock amp do I tap in with the loc wires I have above, also what PIN number and color wire to tap. I’m confused since my loc wires say “front” shouldn’t they be “rear”? https://www.bimmerfest.com/forums/at...4&d=1455548260

sorry for the dumb question I’m a newbie and don’t wanna burn anything in my baby 25i