MacBook Pro 13" Retina Display Early 2013 SSD Replacement - iFixit Repair Guide
Amazon.com: Odyson - 1TB SSUBX SSD (PCIe 3.0 x4) Replacement for iMac & Mac Pro (Late 2013-2015) : Electronics
How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac (Late 2013) iMac14,1 iMac14,3 - YouTube
SSD Upgrades for Apple iMac 27-Inch Late 2013 - 2019
Amazon.com: Cloudeck NVMe SSD 512GB PCIe Gen3x4 Internal Solid State Drive with 3D NAND for MacBook Air (Mid 2013-2017), MacBook Pro(Retina, Late 2013- Mid 2015), Mac Pro(2013) & Mini (2014), iMac(2013-2017) : Electronics
How to Speed up your iMac with a NVMe 960EVO M.2 SSD - YouTube
iMac Late 2013 21.5 SSD Upgrade - YouTube
Hard Lesson Learned With Late-2013 Apple Products Containing Lesser Performing 128GB SSDs | The SSD Review