This is a subminiature speaker for a toy, or possibly a music-playing
device. The only way you're going to find a replacement is to start
searching parts catalogs.

It's indeed a small speaker. I should have put a ruler next to it when
taking the photo. Or use a 3D scanner....
Here is the complete pictu
http://postimage.org/image/k1tdf0ygx

This kind of miniature speaker system is fairly common. I would suggest
simply buying a new one.

http://www.monoprice.com/products/pr...seq=1&format=2

http://www.monoprice.com/products/pr...seq=1&format=2

http://www.monoprice.com/products/pr...seq=1&format=2