if thats the case you can always role the arches.like i had to do with mine. cost about £120 to get done pro. but can be done youself useing basic tools. a rubber mallet and a plank of wood. jack the car up take off wheel.easyer to take the arch lining out also.most cases a screwdriver for this, then to role place wood against the inside of arch and hit the wood with the mallet.
i did this method and got fustrated as it takes ages.so i used the jack that came with my car. same as above but have the car on an axlestand. the place wood on isnide of arch and the jack inside the arch and open the jack up. SLOWLY. dont worrie about bubbles as the wood softens the force and opens the arch in more diamiter than up you just used the mallet or jack on its own. repeat the method all round the arch.
its also a good idea to have a friend to heat the paint up a lil for you so that the paint doesnt flake when opening. good luck again