I would think the 8643 - 8088 cable is kinda unicorn. if someone is looking for that internal to external setup.
ASR-71605 Adaptec SAS/SATA 6Gb/s 1GB PCIe x8 3.0 Raid Controller w/ cables | eBay
ASR-71605 Adaptec SAS/SATA 6Gb/s 1GB PCIe x8 3.0 Raid Controller w/ cables | eBay