I installed the same kit as the OP but opted for the battery harness. The only hitch was the seller forgot to provide the battery harness relay which necessitated 2 attempts before figuring out that was the problem. After I got the harness, the install was easy. I've attached a few pics of where I located the ballasts and harness.


Passenger side: Ballast is the box with the black and white wires exiting.


Driver side

Battery harness attached to battery.

Black box with writing is relay. I note that I pulled the harness up to take a picture.

The dang relay!

Now I need to upgrade the DRL and fog lamps to 6000K to match as they are awfully yellow.