A frame for a reciprocating sieve assembly comprising: a first side member (300, 308) that is elongate and extends longitudinally, a second side member (302, 310) that is elongate and extends longitudinally, a third side member (304, 312) that is elongate and extends transversely, a fourth side member (306, 314) that is elongate and extends transversely; a first hanger mount (206L, 210L) coupled to and extending between the first side member and the third side member, a second hanger mount (208L, 212L) coupled to and extending between the first side member and the fourth side member, a third hanger mount (206R, 210R) coupled to and extending between the second side member and the third side member; and a fourth hanger mount (208R, 212R) coupled to and extending between the second side member and the fourth side member; and respective hangers (110, 112) having lower ends rotationally coupled to each hanger mount (206L, 208L, 210L, 212L, 206R, 208R, 210R, 212R) and upper ends configured to be pivotally coupled to a chassis of an agricultural harvester; characterized in that the first hanger mount (206L, 210L), the second hanger mount (208L, 212L), the third hanger mount (206R, 210R), and the fourth hanger mount (208R, 212R) are comprised of a ferrous alloy, that the first side member (300, 308), the second side member (302, 310), the third side member (304, 312), and the fourth side member (306, 314) are comprised of an aluminum alloy, and that at least one of the third side member (304, 312) and the fourth side member (306, 314) comprises an elongate extruded recess (604, 704, 804, 904) configured to receive and support an elongate sieve element. a first side member (300, 308) that is elongate and extends longitudinally, a second side member (302, 310) that is elongate and extends longitudinally, a third side member (304, 312) that is elongate and extends transversely, a fourth side member (306, 314) that is elongate and extends transversely; a first hanger mount (206L, 210L) coupled to and extending between the first side member and the third side member, a second hanger mount (208L, 212L) coupled to and extending between the first side member and the fourth side member, a third hanger mount (206R, 210R) coupled to and extending between the second side member and the third side member; and a fourth hanger mount (208R, 212R) coupled to and extending between the second side member and the fourth side member; and respective hangers (110, 112) having lower ends rotationally coupled to each hanger mount (206L, 208L, 210L, 212L, 206R, 208R, 210R, 212R) and upper ends configured to be pivotally coupled to a chassis of an agricultural harvester; characterized in that the first hanger mount (206L, 210L), the second hanger mount (208L, 212L), the third hanger mount (206R, 210R), and the fourth hanger mount (208R, 212R) are comprised of a ferrous alloy, that the first side member (300, 308), the second side member (302, 310), the third side member (304, 312), and the fourth side member (306, 314) are comprised of an aluminum alloy, and that at least one of the third side member (304, 312) and the fourth side member (306, 314) comprises an elongate extruded recess (604, 704, 804, 904) configured to receive and support an elongate sieve element.