Not sure I follow you here. First this is the IFIXIT guide to gain access to it: [guide|28751|iMac Intel 21.5" EMC 2805 SSD Replacement].
Apple failed to populate to needed hardware on only the very first version of the newer 'Thin Series' 21.5" iMac (EMC 2544) back in 2012 and only in the lower end model which it then finally stopped doing once people complained.
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So the bottom line here is: '''All of the 2014 and the most current version of the 21.5" have the SSD slot hardware present'''
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So the bottom line here is: '''All of the 2016 and the most current version of the 21.5" have the SSD slot hardware present'''
Not sure I follow you here. First this is the IFIXIT guide to gain access to it: [guide|28751|iMac Intel 21.5" EMC 2805 SSD Replacement].
Apple failed to populate to needed hardware on only the very first version of the newer 'Thin Series' 21.5" iMac (EMC 2544) back in 2012 and only in the lower end model which it then finally stopped doing once people complained.
So the bottom line here is: '''All of the 2014 and the most current version of the 21.5" have the SSD slot hardware present'''