Went to a repair shop today to get screws for my PB G4 luckily they had an old PB there. Almost asked if they would sell it but decided against it though they do seem to get the towers occasionally. If I had went there a few months ago I could have gotten a G4 Anyway found these speakers and got them for $5. How can I use them? they won't plug into any jack. Is there something missing? Can I use these without another part?