Apple Adds Early 2011 13-Inch MacBook Pro to Obsolete Products List - MacRumors
Amazon.com: HIGHFINE 2nd 2.5'' SATA HDD SSD Hard Drive Disk DVD CD ROM Optical SuperDrive Caddy Tray Adapter for Apple Unibody MacBook/MacBook Pro 13 15 17 Early mid Late 2008 2009 2010 2011 2012.etc : Electronics
APPLE MACBOOK PRO 13" A1278 EARLY 2011 I5 RAM 8GB SSD 240GB HIGHSIERRA GRADO B
Apple MacBook Pro Late 2011 8GB Memory & SSD Upgrade - YouTube
MacBook Pro 15" Unibody Early 2011 Hard Drive Replacement - iFixit Repair Guide
Early 2011 Macbook Pro Upgrades | MacRumors Forums