SSD Speed Variations in 2014 MacBook Air Still Due to Drive Brand Mix, Not Broader Changes - MacRumors
Late 2013-2014 Macbook Pro Retina SSD Upgrade Notes - YouTube
Amazon.com: USB C 3.2 Enclosure for 12+16 PIN MacBook SSDs, PCle SSDs Enclosure Supports for 2013-2017 MacBook Air, 2013-2015 MacBook Pro Retina, 2013-2014 iMac, 2013 Mac Pro, 2014 Mac Mini : Electronics
QNINE USB 3.0 PCIe SSD Enclosure for 2013 2014 2015 2016 2017 MacBook Air Pro Retina, USB External Reader for A1465 A1466 A1398 A1502 SSD Adapter, Support 12+16 Pin : Amazon.co.uk: Computers & Accessories
Upgrading 2013-2015 Macbook Pro SSD to M.2 NVMe | MacRumors Forums