I did some checking on ebay and noticed that a Kingston HyperX Predator SSD M.2 + HHHL PCIe adapter is not that much cheaper than a full HP Z Turbo Drive Gen1 -M.2 drive plus HHHL PCIe adapter.
Why not go for a HP and opt for a Kingston ?
By the way what part number is actually valid for an Gen1 Z Turbo Drive SSD ?