Get collection membership component

I am trying to use workflow to pull a list of computers in an Altiris managed software delivery.  My ultimate goal is to add users to the delivery group but for now I would just be happy to get the wo servers talking.  Based on my debug reports I am connecting to the server but the GUID is not valid.  I am using the GUID from the managed software delivery item I created.  I only have one test PC in the group right now.  I am strting to wonder if I am either using the wrong component or the wrong GUID.  Any help would be greatly appreciated.

Thanks,

Brian