First, you need to order the SCSI HDD hot plug trays (CSE-PT17) and if you need the black version, the part # is (CSE-PT17B). Second, you need to order the SCSI backplane. There are two versions of the SCSI backplane. Dual channel is (CSE-SCA-011) and the single channel is (CSE-SCA-009). You can order the spare parts from our website Accessories Section