SP upgrade SAP_HRCUS component

Hi all,

I did component upgrade in my ECC6.0 system,i need to upgrade sap_hrcus is latest level 79 MANDATORY and sap_hr should be n-1 that is 78 level so when i upgrade SAP_HR 78 and SAP_HRCUS is also showing 78level am not able to upgrade SAP_HRCUS 79level even we dont have 78level support pack per SAP_HRCUS, if i tried from front end also it is not showing in system status.

please suggest me how to do.

Thanks in advance...

Srikanth.