Just posting this in case it's any use to anyone.
The fan on my CyberStorm PPC was exhibiting the "hum of death" noises, so I decided to look for a new one.
Took a trip down my local PC World, and saw they sold a chipset cooling kit by StarTech, £6.99. I couldn't find any loose 30mm fans, so I got this kit, which includes:

(plus some sticky pads for the heatsinks)
It turns out that the smaller heatsink fits on the SCSI chip
perfectly! Fan is an Evercool model and is pleasantly quiet; the only model I could find online after 5 minutes of searching. The leftovers will go in my spares box, but for what it's worth, it fits my CyberStorm quite well:
CloseupThe larger chipset heatsink is just slapped on the 060 for the hell of it; I know it's not very suitable but if anyone has any tips as to where to find a better fitting one, please tell!

Hope this helps anyone looking for CyberStorm cooling bits.