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For dual Z:
Z_Axis_Linear_Rail_Bracket_Left/Right are at the bottom; there are two of each or 4 in total.
Z_Axis_Linear_Rail_Bracket_Double_Z_Left/Right are at the top; also two of each or 4 in total.
Z_Nut_Bracket_T10_Nut would be for a 10mm lead screw nut vs the standard 8mm.