Found this site, but it's in Hong Kong and also from the pictures it looks like there's no flash difuser in some, but then it does look like there is in others. This site also has more color options.
http://www.dpgate.com/Distinct-Alum...p-and-Bottom-for-iPhone-4S---Black_p2578.html
just heard back from seller, he said it was a mix-up, apologized and said he will send out the correct back right away. Will post back when I receive it.
same thing just happened to me...gonna contact seller now
This is the response I got from the seller.
"I am sorry for the problem. The supplier sent me a little different back in our last shipment. If I had the right one I could exchange it for you but as I said the supplier sent me something different. If you are unhappy and would like to return the back I can send you a return label and give you a refund no problem."
I just hate that if this is the case (got a different product from supplier), why didn't he change the picture on ebay. Don't put a picture up of something and then send out something else.