I'd go for a free sample from Molex. Just make sure to check the pitch and make sure that it looks like it would mate properly (look at the mechanical drawings from Molex). Remember you'll need the crimp receptacle as well the crimp terminals (and a way to crimp the wires to the terminals).
Hope this helps.
Alternatively you could just solder a new 4 pin connector onto the board or just solder the wires directly.
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