I fitted the Stebel TM80. It went straight in really. I had to drill the bracket out but then I noticed it came with a bracket! Doh! Anyway, I put a clip together but of course iMovie caps the sound so you can't hear how much louder it is, lol! But trust me, it's a marked improvement over the one that was on there!
https://m.youtube.com/watch?v=_JaxQ7CxFTo