The Speck website states that the See Thru case for the 15" MBP is compatible with BOTH the CD and C2D MBPs. How is that possible? Do they ship both bottoms? Does anyone have first hand knowledge (i.e., actually bought the C2D version)? I'd appreciate it. BTW, I tried emailing Speck customer support but I still haven't heard from them (it has been about a week).