SCSI 2 devices typically use the HPDB50 connector, while the wider HPDB68 connector is used for SCSI 3 connections. You can connect your SCSI 2 and SCSI 3 devices together using this adapter from Monoprice!
This adapter features a male HPDB68 connector, for connecting to SCSI 3 devices, and a female HPDB50 connector, for connecting to SCSI 2 devices. The entire adapter is molded. The male end includes thumbscrews for securing the adapter to the panel connector, while the female end includes both edge clips and screw holes for securing to a line connector.