Hello everyone, I accidentally hit a huge dent into the topcase of my girlfriend's MacBook Air. I want to replace the part myself but they are very hard to get and expensive. Could I buy a used / damaged 2010 MBA for the part? The reason: 2010's go cheaper on eBay than 2011's. So, has anyone done this before? I can't find any definite answer saying that the topcase is interchangeable on these machines. thanks!