or
select your year 2006 2007 early 2008 late 2008 early 2009 mid 2009 2010 2011 mid 2012 non-Retina mid 2012 Retina early 2013 late 2013 mid 2014 2015 2016 2017 2018 2019
(year is specified in "About this Mac" from the Apple menu in the upper left corner of your screen)
