Does it sit flush In to the pre existing holes , you don’t have to tinker about with it do you?
The original diffuser has 5 screws and two plugs. The reiger one, three of the screws are used by the diffuser with inch long spacers, and then two screws need to be screwed in to the plastic that is part of the wheel arch. Very discrete part of the bodywork. The two screws and the plugs that are not used are covered by the diffuser. Although if you wanted to you could drill holes in the diffuser and use all 5 existing screw points. Either way, two holes need to go somewhere.
It comes with a fixing kit so you don't need any extra parts.