Need an idea of repair cost.

[vannus]

Anyone have any idea of cost to repair rear bumper. Wife reversed over a high kerb and has broken the clips that hold the coloured diffuser at rear onto the black section that house 2 of the reversing sensors. This also requires replacing as it has also burst the retaining part on this. Really annoying as all the damage is to the three retaining clips and not much else. pic of affected are attached(not my car).
looking from behind centre of coloured diffuser hangs a down a little.