How to install an SSD on a 15-inch Retina MacBook Pro
OWC 240 GB Aura SSD Flash Internal Drive Upgrade Kit for Mid-2013 and Later MacBook Air and Mid 2013-Mid 2015 MacBook Pro with Retina Display : Electronics
MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) SSD - iFixit Store
Technology
hardware - MacBook Pro, Mid-2014, SSD replacement - Ask Different