Hi, I'm replacing the top case on my mid-2007 MBP because the trackpad and keyboard have stopped working. I would just replace the cable, but the case has also suffered some serious cosmetic damage which now prevents the laptop from shutting properly, and just looks ugly. I don't have the cash to buy a new laptop anytime soon, and there's no way I'll make much selling an old laptop as damaged as this, so replace the cases it is! Right so, I found some really good deals on used top cases on Powerbookmedic.com, with a year long warranty and everything. I can buy the one for the Santa Rosa (my model) for $99.95. However! They also have top cases for the previous Core 2 Duo models for $49.95. Now I can't personally see any difference between the design of these two models. So would I be able to purchase the top case off the older model and save myself 50 bucks? Or are these two models incompatible with each other in some other way? Thanks in advance!