So I failed to do all of my research before buying take-off leather and ended up with the old style leather head rest covers when my late 2012 has adjustable ones.

Does anyone know a place where you could buy a pair of covers/any other solution? I've scoured the entire internet for a long time now, and nothing!

 

MRT for aftermarket, try eBay or mpsautosalvage for stock....

 

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^This.
I think you now have to get MRT adjustables.

 

I just looked at MRT's webpage...it looks like you can only get leather headrests. No option for those of us with cloth interiors...