What is the MKS Base AUX header connector type?
You need a 2.54&nbsp;mm pitch (similar pitch to Dupont) female IDC (insulation displacement connectors on a ribbon cable) connector of 2x5P (pins) for the header connectors that have a notch. (for comparison, note that e.g. RAMPS 1.4 has 2x5p dupont headers on the shield for the AUX headers, not the notch type headers)



These connectors are usually crimped onto flat ribbon cables and used to connect the display to the board. These connectors have a rectangular notch to fit the gap in the housing to correctly position the cable (which the 2x5P Dupont don't have). 



For reference/difference, an image of the Dupont 2x4P and 2x5P is shown below, highlighting both sides ("up" on the left, "down" on the right):