elektrinis

So I have a Impreza 2008 hatchback (2.0 N/A) with rotten rear arches. I want to carry out repairs that will hold several years and this is usually done by cutting away a piece of body panel and replacing with new piece. I was able to find panels for pre-08 cars, and also front arches for 08+, but nothing for rear. Anyone tried this method and maybe found a source to buy this?