Retrofitting heating elements to front seats

Hi guys. 

I've bought some heating elements that I want to put into my front seats. 

My car came without heated seats and it is now time to get some heat in them for winter time....

Did buy this wire harness some while back and installed it earlier this year and also have the climate control panel sorted.

https://www.cars-equipment.com/en/shop/seat-heating-parts-comfort-6/wiring-for-front-seat-heating-retrofit/

So I bought these parts : 

1Z0963555H     x2stk    seat element                   
1Z0963557N     x2stk    back element                
1Z0963556B     x2stk    side element                
3B0972712       x2stk    connector 2-pin

5K0959772                     control unit

But when putting these parts together I need a connector to fit into the large black plugs from the wire harness that sits under each front seat. Also need some wires and connector to fit into the control unit..

Anyone ever done this fit and got some info to share?