NOAO is testing Scientific Imaging Technologies, Inc. (SITe) thinned backside 2k by 4k charge coupled devices (CCDs) to be used at KPNO and CTIO. NOAO's Mosaics will use as the basic 'tile' the SITe ST-002A CCD Imager. These CCDs will be used to upgrade the wide field Mosaic imager now in use at KPNO's 4- Meter Mayall telescope and 0.9-Meter telescope. SITe 2k by 4k CCDs will also be used in MOSAIC II now under construction for CTIO's 4-Meter Blanco telescope. Additionally NOAO will implement 2 Mini-Mosaics in the two device 4K by 4K configuration. The first of the ST-002As arrived in mid August 97 and this paper will discuss test results of all devices received and tested prior to publication. Additionally this paper will discuss the mounting methods of Mosaics. This will include; geometric stability, techniques used for measuring CCD surface flatness and co-planer requirements for NOAO's Mosaic Instruments.