Scratched camera lens replacement

It is not not clear to me if the lens comes with the replacement housing sold here on iFixit.com. If iFixit.com sells the lens only, I cannot seem t find it. The lens I have is scratched and I want to replace it. But I read the ones on eBay are crappy. No big surprise there, but I have looked at the instructions and the product descriptions and cannot tell if the back case has a new lens in it. Anybody know?