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
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MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) SSD
MacBook Pro 13" Retina 512GB Blade SSD Solid State Drive, Late 2013 / Mid 2014 - 661-8139
PCIe SSD – Apple MacBook Pro 13″ / 15″ Retina (Late 2013, Mid 2014)
How to Upgrade Retina MacBook Pro SSD Storage: 13-Inch: EveryMac.com