Yes, they are designed to reuse the factory gaskets, which are a ring (not sure it's copper, brand new it's silver colored) that needs to be swapped.
When I talked to RCZ's installer (recalling the conversation) I probably was not clear on this point, as he was looking for gaskets in the box, but the instructions say to swap the OEM gasket (which doesn't look like a typical gasket).
I believe I was not clear in my explanation, and for that I apologize..
EDIT: Here's a photo of a similar 'gasket'