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 female HPDB68 connector, for connecting to SCSI 3 devices, and a male HPDB50 connector, for connecting to SCSI 2 devices. The entire adapter is molded. The male end includes side clip release latches and side clips for securing the adapter to a panel connector, while the female end includes nuts for securing to a line connector.