Hi, you do not need the extra fittings, as 8 are included in the scope of delivery. That should be enough to be able to connect the radiator.
Do you want to use the Alphacool Aurora XPX RGB Chrome Frame for the included XPX cooler? If so, this will not work, as the LED frame only makes sense for the Plexi clear or satin XPX cooler.
I recommend a second bottle of coolant, as one with an additional radiator & GPU cooler will not be enough.