CAB files missing drivers XE2 7720

I have tried to import CAB files for both of these models into SCCM and am receiving "some drivers were not imported successfully", which so far has meant that drivers were missing; usually I can download the individual driver that is missing and import that way, but for these two models the drivers that are being flagged as missing are not available as separate downloads, or lack an inf file (executable only). I really need to get this fixed as we cannot image these models until we have a complete driver set. OptiPlex XE2 win7-64 Precision 7720 win7-64