Are chaps are aware that any Scsi drives can be connected to 50pin connectors regardless of the of drives connector ?
80 pin sca U160/U320 drives can be used, your not restricted to just 50 pin physical. There are plenty of Ex-U160 9gb/18gb drives out there.
I have box with around 200 in.(Sorry not for sale as they contain patient data and are due for crushing)

Edit: Its morning here, just forgot, there is also scsi 3/wide connectors (68pin connectors as well!)