I have one of these, but it was severely damaged and only the fan itself can be salvaged. I have considered welding up a box that will replace it, but I could use a legit replacement unit, as I run a lot of cards (TWGS, SCSI, Stereo Sound, 3.5 Drive) and want to keep the system cool.
If anyone has a spare, please let me know before I go through the trouble of fabricating one. I haven't seen any on eBay of late, or elsewhere, probably because fewer people are selling or trading things.