for instance, if you are installing WAS v7.0 on Windows, the part numbers are:
Workbench
IBM Support Assistant V4.0.2 Workbench for Windows on x86-32 bit for WebSphere Application Server, V7.0 Multilingual (C1G27ML)
Agent
IBM Support Assistant V4.0.2 Agent for Windows on x86-32 bit for WebSphere Application Server, V7.0 Multilingual (C1G28ML)
but you really need to look for it carefully into the listed files.
Cheers,
Alexei