Are there differences? I have a Late 08 MBP 15" and the case has been dented badly, but it otherwise functions perfectly. If I find an upper case (this: http://www.is-pc-parts.com/images/Mac Replacement Parts/13015787750.jpg) from a newer Mac will I be able to install my older hardware inside it? I've found many many upper cases on eBay that claim to be model A1286 (same as mine) but from 2010-2011 as well as 08 and 09 Is this because it hasn't changed at all? Note: I know apple made the batteries built-in since my model, but the framework for the battery door is removable if I recall from the various times I've opened mine up, so I could transfer it to the new case maybe? If the design has changed enough to not work for what I want to do, how do I identify the one model that will work?