Hi there,
If they are Fibre Channel drives then just stick them back on e-bay and get some money back you won't find a converter to get them onto the SCSI bus.
You can put SCSI onto Fibre Channel with an expnsive SCSI-FC bridge but it won't go the other way.
Just to check, what does the connector look like on the rear of the drives, UW/LVD-SE SCSI is fairly easy to spot as it's a D shapped connected with 68way female connector (block with pin holes in it) there will also be the power connector, Fibre Channel is also D shaped but much smaller and looks more like a card -> slot arrangement and only about 20 connectors in there and no molex power connector.
When you do finally get a 68way SCSI disk connect it as follows :
Header 1 - Active terminator
|
Header 2 - CyberstormPPC
|
Header 3 - Hard drive
|
Header 4 or on hard disk - Active Terminator
Easy to do, don't fold the cable to much, don't go beyond 3 foot of cable.
Regards