X3 (w/o DSP w/o NAV) Subwoofer installation

[JuuKoo]

I am looking for color codes, or pin order of (BMW Business CD, w/o DSP and w/o NAV) factory amplifier. I am installing amplifier and subwoofer (Basslink) and looking for the best place to tap Basslink to signal lines.

I have already factory amplifier "in my hands", so it would be pretty easy to tap the Basslink to back of this amplifier (speaker lines), but I just do not know correct pin order or color codes (and my IE is not working, so can not look the online WDS).

Does someone remember the colors, or pin order of rear and front speakers?

Of course, I can measure signal levels of these lines, but it could save some time to find the correct lines without major testing.
I would appreciate any feedback a lot, my car is waiting the sub

[JuuKoo]

Update I) I already found the factory amplifier pin assignments (plug connector X10266, A18 amplifier (online WDS))

Update II) Installed the Basslink today evening and it is up and running....

Update III) Finally got some pictures from sub itself and remote control button. Unfortunately I have no pictures from installation phase, but if someone wants to get some additional information, please do not hesitate to send PM for me.