That's actually made by AMP, not Molex (though Molex may cross it - I don't remember).
The mating housing is AMP P/N 1-480700-0. Suitable contacts for 18AWG are AMP P/N 350547-1.
Newark/Farnell stocks these, at least in the US (as do the old favorites Digi-Key and Mouser). Dunno about Europe.