Fastlane is 50 pin though... why would you need a 68 pin one? (unless it's destined to be moved around between systems, I guess).
Anyway you'd have better luck with Seagate 68-pin drives (either SE or LVD). These don't require the presence of bias voltage on the high-byte lines and are thus compatible with narrow SCSI controllers using plain passive 50-68 converters.
Probably other brands/models behave the same, but with Seagate I'm fairly certain this behaviour is consistent across all models.
You can also get by using a 68-pin model that requires said bias voltage as long as it's an SE one, and you enable its own active terminator (this effects said bias voltage - the catch this way is it must necessarily be at the end of the SCSI bus, as a SCSI terminator must always reside at the end of the SCSI bus, be it standalone or integrated in a SCSI device).
LVD models never have an own terminator and as such can't effect bias voltage on the high byte (connecting an external terminator will have no effect - it will properly terminate the bus but won't produce the necessary bias voltage). So unless it's a Seagate LVD model (or other known well-behaved drive with respect to bias voltage) avoid LVD ones.
HVD models are completely incompatible and will result in smoke if you connect them to an SE bus (LVD ones are usually LVD/SE autosensing or at the very least include a Force SE jumper to make them compatible with traditional SE buses).
