My girlfriend's MacBook has some deep scratches on the bottom that a polish kit would not fix. I wanted to buy a new bottom cover and replace it for her. I have found quite a few on eBay, but I am not sure on which model will fit. She has the new white NVIDIA MacBook. I assume that because the motherboard is different, would she need a case specific for the NVIDIA model, or will an older Core 2 Duo case work all the same? Any help is appreciated, thanks.