Amazon.com: PCIe NVMe Gen3x4 SSD 1TB 512GB 256GB 128GB 3D TLC NAND Flash Hard Drive SSD Replacement for Macbook Air 2013-2017, Macbook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
M.2 Nvme Ssd Convert Adapter Card For Macbook Air Pro Retina 2013-2017 Nvme/ahci Ssd Upgraded Kit For A1465 A1466 A1398 A1502 - Memory Card Adapters - AliExpress
How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac (Late 2013) on Vimeo
iMac Late 2013 21.5 SSD Upgrade - YouTube
The OWC Aura Pro X2 SSD Review: An NVMe Upgrade For Older Macs