I am pretty sure that that will work, though I havnt actually played around with letters yet, just numbers. The [0-9] part by itself will definitely work calling the 5 digit code you want.
Now, after you do that open your header.php (which you should have already modified with the GT instructions).
There are two arrays you are looking for with tons of strings in them. One is called 'urlin' the other 'urlout'. In this case of course, they are all of the links we are renaming. I havn't read this, but I am more than sure given they are arrays that you MUST KEEP THEM IN ORDER. Meaning, if you add something to position 1 in 'urlin' it must match position 1 in 'urlout'. To keep it simple, just append them both at the very bottom.
If you havnt yet modified them, the last few lines should look something like this for 'urlin':
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