How to Install/Upgrade the PCIe SSD in a 27-inch iMac (Late 2013) iMac14,2 - YouTube
2013 MacBook Air NGFF PCIe SSD Review (256GB) - Pre-Configured MBA Doesn't Set The 'PC' Performance Bar | The SSD Review
ACASIS 10Gbps to Mac SSD Enclosure for Apple MacBook Air Pro, iMac from 2013 to 2017 Flash 12+16 PIN SSD Compatible with M.2 Nvme SSD with Adapter, Mac3W - Walmart.com
DIY 2013 iMac SSD Upgrade! - YouTube
ACASIS 10Gbps to Mac SSD Enclosure for Apple MacBook Air Pro, iMac from 2013 to 2017 Flash 12+16 PIN SSD Compatible with M.2 Nvme SSD with Adapter, Mac3W - Walmart.com
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
Apple iMac 21.5 A1418 27" A1419 128GB SSD Hard Drive (Late 2013) 2014 2015 2017 | eBay
Amazon.com: INDMEM PCIe NVMe Gen3x4 SSD 1TB 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