You're looking for
acard SCSIDE AEC-7720U.
I've got two of the SCSI2 kind, and they work perfect on my BlizzPPC SCSI. Currently I've got two matrox IDE hds, 40 and 60 gig ones. The speed is awesome, 9.7mb/sec (max of BlizzPPC), and the seektime of the new SCSIDE hds beats the sh*t out of my old SCSI hds. My boot time halfed(!) the the new drive (the old one was real scsi).
The new SCSIDE have a flashrom that support upto 160gig hds (last time I checked, it could be more now), and the older ones can be flashed with a PC or Mac (I won't bother though, I'm happy with upto 120

.
Personally I'd never go back to real SCSI hds again, they're just too damn expensive and usually noisier than IDE hds.
Cyberstorm MKI SCSI2 should be just fine with SCSIDE, since it looks 100% normal SCSI device to it.
You can get the SCSIDE from
KDH (for example).
One nice bonus of SCSIDE is that you don't need to reformat to use your old IDE hd with it. Just plug SCSIDE and plug the hd to SCSI bus, and you see all your data thru it. And should SCSI give you some trouble, just unplug the drive from SCSIDE and use it thru IDE bus. Cool :-)
Here are the manuals of the AEC-7720U (scsi2 model):
aec-7720_bridge_qig.pdfaec-7720u&uw.pdf