Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid-2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New :
Padarsey 2nd HDD SSD Hard Drive Caddy Tray Replacement for MacBook Pro 13/15/17 A1278 A1286 A1297 2008-2012 2.5 Inch 9.5MM - AliExpress
2.5" SSD 500GB solid state drive MacBook Pro a1286 a1278 a1297 a1181 Mavericks 887276057491 | eBay
Upgrade the Hard Drive on a MacBook Pro (HDD + SSD) : 4 Steps (with Pictures) - Instructables
512/500GB SSD Upgrade Macbook Pro 13 15" 2011 2012 A1278 A1286 A1297 High Sierra 689853511507 | eBay