2015 Sierra Audio Upgrade

[Bradford]

I done a few searches on the forum and want some clarification if i reading things correctly. I have a 2015 Sierra extended cab, no factory bose with 8" screen. My plan to listed below:

Factory head unit. Come out of the head unit (green plug) with a Metra 71-2107 into AudioControl LC7i. Out of the LC7i and into a 4 way amp into 6.5 components in front door and 6.5 2 ways in rear doors. Also out of LC7i into sub amp into single 10" under rear seat. 

Question is will the Metra71-2107 harness mentioned allow this plan to work, as I believe I am reading in other threads, or do i need to switch to the Metra 70-2057 harness?

Thanks for the help guys.

[Nasty]

11 hours ago, Bradford said:

I done a few searches on the forum and want some clarification if i reading things correctly. I have a 2015 Sierra extended cab, no factory bose with 8" screen. My plan to listed below:

Factory head unit. Come out of the head unit (green plug) with a Metra 71-2107 into AudioControl LC7i. Out of the LC7i and into a 4 way amp into 6.5 components in front door and 6.5 2 ways in rear doors. Also out of LC7i into sub amp into single 10" under rear seat. 

Question is will the Metra71-2107 harness mentioned allow this plan to work, as I believe I am reading in other threads, or do i need to switch to the Metra 70-2057 harness?

Thanks for the help guys.

Jll customs non bose harness with loop back