MacBook Pro 15 A1398 How to install M2 SSD upgrade - YouTube
How to Upgrade the PCIe SSD in a 15-inch MacBook Pro w/ Retina display (Late 2013 - Mid 2015) on Vimeo
Amazon.com: 256GB SSD Hard Drive for Apple MacBook Pro Air 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013-2015) / OSX Sierra/Mac Pro A1481 : Electronics
Upgrade SSD on Mid-2015 15" Retina. Which SSD? | MacRumors Forums
How to install an SSD on a 15-inch Retina MacBook Pro
How to install an SSD on a 15-inch Retina MacBook Pro
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide