Setting a parent contextual menu location without an ID

Hello there, I am trying to add a command to a contextual menu in the PDW menus, and I'm not sure how to do so because I don't have an ID for the parent menu.

I did find the GUID of the parent menu, which is 735BFA87-9F25-417F-A3BF-A20035DB2C5

This is what I tried, but it was not happy:

<Groups><Group guid="guidWSSMSPackageCmdSet" id="WSSMS" priority="0x0300"><Parent guid="guidSHLMainMenu" id="735BFA87-9F25-417F-A3BF-A20035DB2C5C"/></Group></Groups>

Any help would be amazing!

Thanks!