How to Install/Upgrade the PCIe SSD in a 27-inch iMac (2019) on Vimeo
DIY Bundle - 2TB OWC 6G SSD and HDD Kit for 27-Inch iMac
Timetec 512GB MAC SSD NVMe PCIe Gen3x4 3D NAND TLC Read Up to 2,000MB/s Compatible with Apple MacBook Air (2013-2015, 2017), MacBook Pro (2013-2015), iMac (2013-2019), Mac Pro (2013), Mac Mini (2014) - Newegg.com