A combine feeder slat (300, 800, 900) comprising: a first base located at a first end of the feeder slat, the first base having a first lower surface and a first upper surface opposite the first lower surface, the first base being configured to mount to a first conveyor strand (318, 600) with the first lower surface facing the first conveyor strand; a second base located at a second end of the feeder slat, the second base having a second lower surface and a second upper surface opposite the second lower surface, the second base being configured to mount to a second conveyor strand (320,600) with the second lower surface facing the second conveyor strand; and a slat body extending in a longitudinal direction and connecting the first base to the second base, the slat body comprising a variable profile as viewed along the longitudinal direction, that transitions from a first profile shape at the first base, to an intermediate profile shape between the first base and the second base, to a second profile shape at the second base, the intermediate profile shape comprising a front lip, a rear lip, and an upward-facing concave projection that connects the front lip to the rear lip and extends below an attachment plane defined between the first lower surface and the second lower surface, the front lip and the rear lip being located above the attachment plane and extending from the first end of the feeder slat to the second end of the feeder slat; the first profile shape comprising a first upward-facing concave U shape formed by the first base, the front lip and the rear lip; the second profile shape comprising a second upward-facing concave U shape formed by the second base, the front lip and the rear lip; characterized in that the first base, second base, and slat body comprise a unitary wrought metal part and the upward facing concave projection of the intermediate profile shape is deeper in a vertical direction than the first upward-facing concave U shape and the second upward-facing concave U shape. a first base located at a first end of the feeder slat, the first base having a first lower surface and a first upper surface opposite the first lower surface, the first base being configured to mount to a first conveyor strand (318, 600) with the first lower surface facing the first conveyor strand; a second base located at a second end of the feeder slat, the second base having a second lower surface and a second upper surface opposite the second lower surface, the second base being configured to mount to a second conveyor strand (320,600) with the second lower surface facing the second conveyor strand; and a slat body extending in a longitudinal direction and connecting the first base to the second base, the slat body comprising a variable profile as viewed along the longitudinal direction, that transitions from a first profile shape at the first base, to an intermediate profile shape between the first base and the second base, to a second profile shape at the second base, the intermediate profile shape comprising a front lip, a rear lip, and an upward-facing concave projection that connects the front lip to the rear lip and extends below an attachment plane defined between the first lower surface and the second lower surface, the front lip and the rear lip being located above the attachment plane and extending from the first end of the feeder slat to the second end of the feeder slat; the first profile shape comprising a first upward-facing concave U shape formed by the first base, the front lip and the rear lip; the second profile shape comprising a second upward-facing concave U shape formed by the second base, the front lip and the rear lip; characterized in that the first base, second base, and slat body comprise a unitary wrought metal part and the upward facing concave projection of the intermediate profile shape is deeper in a vertical direction than the first upward-facing concave U shape and the second upward-facing concave U shape.