They sell it
Here
Too much if you ask me for such dated equipment.
As for SCSI, just make sure you set the Devices ID (usually on the back of the drive) to something other than 7 as that is the address on the channel for the SCSI adpater.
Then it is just basically plug and play.
Install the adapter, and once you do, the system will let you find the drive, or do it itself.
Good Luck
P.S. I also recommend a newer medium such as DVD-RW/+RW/RAM