1 2U 2.5" SATA/SAS 8-Bay backplane 2 SR650 second& third 8x2.5" or 12x3.5" NVME HDD backplane power cable 3 SR650 8x2.5" HDD backplane signal cable 4 SR550 8x2.5" HDD backplane signal cable 5 SR550 second 8x2.5" HDD backplane power cable, SR650 first 8x3.5", 12x3.5" or 8x2.5" HDD backplane power cable 6 SR550 first 8x2.5" HDD backplane power cable 7 4x1 2.5" HDD filler 8 1x1 2.5" HDD fillers (4)