The purpose of this administrative supplement request is to allow us to procure a “K-B focusing mirror system and monochromator upgrade for the BioCAT Beamline 18ID at the Advanced Photon Source.” New focusing mirrors are required to take full advantage of the improved source characteristics of the upgraded Advanced Photon-Source (APS-U). A new commercially supported monochromator is required to replace our 27 year old monochromators that are no longer supported by the APS and will provide improved beam stability .