Abstract: A seat structure may be installed in a seat assembly. The seat structure may comprise plurality of tube members forming a substantially closed structure. Some of the tube members have a substantially uniform cross-sectional area along a substantial portion of its respective longitudinal length. At least a first set of the tube members has at least one of a different dimensional property and a different material property from a second set of the tube members such that mechanical properties of each tube member is configured for stress requirements for a respective region that the respective tube member occupies. The plurality of tube members are joined such that the plurality of tube members are in fixed positions relative to each other.

Abstract: A track system for adjusting the position of a vehicle component is provided. The track system comprises a first lower track member (22), a second lower track member (26) and an upper track assembly (24, 28) moveable relative the first lower track member (22) and the second lower track member (26). The upper track assembly (24, 28) includes a first upper track member (24) associated with the first lower track member (22), a second upper track member (28) associated with the second lower track member (26) and a member (29) extending between the first upper track member (24) and the second upper track member (28) to support the first upper track member (24) and the second upper track member (24) in a use position relative to the first lower track member (22) and the second lower track member (26). The first upper track member (24) and the second upper track member (28) are not supported in the use position until the member (29) is provided.