Sadly, as of 19JUL2012, they still have not posted that replacement part. I to am in the same boat you are in.
This is being written two tears after the original thtread - my 230mm just quit after a few years of service. Thermaltake made this difficult because they spec'd a fan that was only 20mm deep - and I took advantage of that narrow shape in building my rig - my cooler fins barely clear the fan.
I've found 30mm thick replacements, but they won't cut it. When I called Thermaltake directly, they said they were about to post a repair part on their website later today (what a coincidence). I am afraid to hold my breath, because I've been looking for months and haven't found what I need to date (my original part also had blue lights - which still work).
Perhaps Themaltake will come through - I'm posting this so anyone else looking for this fan can see their web site for possible help in the near future.
- WDF01 -