Amazon.com: OWC 2.0TB Aura Pro X2 SSD Upgrade Compatible with Mac Pro (Late 2013), High Performance NVMe Flash Upgrade, Including Tools & heatsink : Electronics
OWC 4.0TB Aura SSD for Mac Pro: Internal Solid-State Drive Upgrade and Envoy Pro Storage Solution Model OWCSSDA13MP4.0K - Newegg.com
OWC Aura SSD for Mid-2013 or Later Mac - OWC Digital