iMac M.2 NVMe SSD Upgrade from the SLOW Fusion Drive (No Opening Needed) - YouTube
Upgrading an older iMac's PCIe SSD: Third-party solutions that save you beaucoup bucks
M.2 NVME SSD Convert Adapter Card for MacBook Air Pro Retina (Year 2013-2017), Sensico NVME/AHCI SSD Upgraded Kit for A1465 A1466 A1398 A1502(Not Fit Early 2013 MacBook Pro) : Electronics
How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac
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 Install a PCIe SSD in a 27-inch iMac (Late 2013)