i've found only complete housings on ebay - but since the prices are ok, i would go for those parts.
they are original and you only put the logic board from your phone in the other case.
one of those buy now offers has the number: 250660774802 - put that into the ebay search and you will find that offer.
i'm not related to the seller in any way - i only used the ebay search and give you one of the results