How does this MDI connect in?

As I don't like the massive pass through quad lock connectors required for the usually MDI or BT retrofit, I searched for more options and came up with this from Cars Equipment:

The three loose wires are CAN high / low & an earth / ground and need to be joined to existing wires. How does the little metal connect plug in to the Quadlock?

I'm guessing that it needs to go to connector block 4:

But do any terminals need to come out first of that connector first (it's for a 2010 Yeti with Bolero and BT)?

Thanks for any advice in advance.