It is disclosed a plate for a mould station to form a flanged hollow plastic container by shaping a flat billet, the plate comprising a base, a frame, an outer core to form a container of a first size and an inner core to form a container of a second size, smaller than the first size, wherein the frame is integral with the base and wherein the frame defines a frame upper surface; wherein the outer core, in a first configuration, is held elastically with its upper surface flush with the frame upper surface and, in a second moulding configuration, is held with its upper surface recessed with respect to the frame upper surface; wherein the inner core, in a first configuration, is held elastically with its upper surface flush with the frame upper surface and, in a second moulding configuration, is held with its upper surface recessed with respect to the frame upper surface; and wherein a retention system is provided to retain said billet substantially adhering to at least the upper surface of the inner core.