iFixit doesn't carry every possible part! They just couldn't as its quite bit of expense to do so. As far as why the costs are higher for the 2012 and newer systems has to do with the complexity of the display, The newer Thin series systems use a custom laminated design vs the older cover glass and discrete display panel which was standard.
There are two versions of the display depending on which system you bought! The Standard or the 4K
Make sure you get the correct one! The logic boards are different as well as the connections.
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Excellent resource. It told me the screen would also not work with 2012, 2013 & 2014 models. Thank you!
da Roy