Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
SOLVED: Best RAM for MacBook Pro Late 2011? - MacBook Pro 15" Unibody Late 2011 - iFixit
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
Upgrading the Late 2011 MacBook Pro to 16 GB of RAM! - YouTube
How to Upgrade RAM in MacBook Pro 17" 2011 16GB Install Tutorial - YouTube