[replacement] Where is the iPhone 2G microphone?

I've looked at many, many guides on the disassembly of the iPhone 2G, such as iFixit's, but non show where the iPhone 2G's microphone is!

I bought a used iPhone on my country's local eBay, but the microphone wasn't working (apparently by a DIY LCD replacement). I bought one over from Hong Kong, and, a week later, I got a very small piece, apparently to solder on, and tools. I opened up the iPhone, but I can't seem to find where to solder the replacement piece.

Even a picture of where this is located will suffice!

Thanks!

http://images.apple.com/uk/iphone/im...s_20090608.jpg

Mic is in the same place in the 2G. Bottom right.
This might also help:

http://www.formymobile.co.uk/iphonedisassembly.php

thanks! but, I believe the iPhone 2G mic is soldered in (where is the question).