So, I've seen the OP's eBay link to the fake white back panel, and while it looks decent (see
picture #1), the ring around the camera doesn't look the same as others I've found there.
Alternatively, I saw
this listing, but the price was over $60 before shipping. It mentions everything, including the glass and diffuser, and it looks identical to what the white model would look like (see
picture #2). In regards to price, as a matter of fact, $60 appears to the bottom range for an "OEM" replacement, and it goes up to $100.
With enough searching, I found
this listing. From the pictures, the camera ring looks like the OEM model, and though it's not specifically mentioned in the description, there appears to be a glass and square for the camera and a glass/diffuser for the flash. It looks as close to the OEM as possible (see
picture #3). At $18.49 shipped, it seemed to be a no-brainer, so I ordered it.
I'll let you know how it goes when I receive it in 8-18 business days (yikes).