Replacement plug on MagSafe adapter?

Question

The plug portion of my power adapter broke off. Fortunately, this piece of the adapter seems to just slide off of the main adapter body, attaching via a round metal piece. So basically I would just need to find a new plug assembly and slide it on.

Has anyone ever done this, or know where I could find such a replacement part? Can't find anything on Apple.com.

Here's an example of what my adapter looks like now:

It looks like this is intentionally replaceable for the purpose of international electrical socket compatibility, so you'd think it'd be easy to find a new plug piece... ?