Abstract: A linear motion bearing assembly is provided and includes rolling element retainer structure, outer housing sleeves, a plurality of load bearing plates and plate retainer structure. The retainer structure of the bearing assembly can be either monolithically formed or, alternatively, assembled from multiple elements. At least a portion of axial tracks are formed in the outer radial faces of the retainer structure with each track having a load bearing portion providing access to a support shaft, rail or spline. An outer housing including a pair of sleeves are provided to encompass and protect the retainer structure and the rolling elements contained therein. One or more of these components is preferably formed of an engineering plastic or ceramic. A plurality of non-metallic load bearing plates, preferably of the self-aligning type, are positioned within the outer housing and serve to receive and transmit loads from the rolling elements in the load bearing portion of the tracks.