MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
MacBook Air 11" Early 2015 SSD Replacement - iFixit Repair Guide
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
How to Upgrade the PCIe SSD in an 11-inch MacBook Air (Mid 2013 – Early 2015) - YouTube