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The diamondesque shaped piece with four holes that mounts on makes up the second half of the Y_carriage part. You can see it near-center on your second photo. I grabbed a capture of it with snip-it (I'm old school) and highlighted it in yellow. Maybe I just missed it in the file list. I can print out the other half and draw up its made in SolidWorks, it's not a big deal and then I'll have it.