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If you want to do the job probaly then yes you do need to change the rear arch liners too. I meant that you dont have to make any alterations to the bumper or fixings
but one problem u will face is that the old plastic plates behind the wheels inside the bumber will be a little but smaller and u cannot fit two screws, actually it doesnt affect much, the picture is below
Those plastic plates behind the bumper are called arch liners. If you want to do the job probaly you have to change those aswell, then all the screws will fit.