Problem mapping VB com code to Python

[max]

I am trying to use a sdk to access quickbooks, the sdk provided a COM
interface and I think it installed the com server files/dlls.  A VB
code example is provided, but I can't figure out how to map "Dim
sessionManager As New QBFC2_1Lib.QBSessionManager"
into a corresponding Python statement, when I try 
obj = win32com.Client.Dispatch("QBFC2_1Lib.QBSessionManager") I get
traceback Shown below.

I have been able to run makepy and it generates a lovely file. I can
find a Type Library, but need a little help mapping this to be able to
access the com object and call its methods.

I have included a snipit of the sample VB code and the traceback from
my attempt to create a client com object ?

Any help much appreciated,

max



=======Traceback =============
>>> o = win32com.client.Dispatch("QBFC2_1Lib.QBSessionManager")
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
  File "C:\Python23\lib\site-packages\win32com\client\__init__.py",
line 95, in Dispatch
    dispatch, userName =
dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
  File "C:\Python23\lib\site-packages\win32com\client\dynamic.py",
line 84, in _GetGoodDispatchAndUserName
    return (_GetGoodDispatch(IDispatch, clsctx), userName)
  File "C:\Python23\lib\site-packages\win32com\client\dynamic.py",
line 72, in _GetGoodDispatch
    IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
pythoncom.IID_IDispatch)
com_error: (-2147221005, 'Invalid class string', None, None)




========= Sample VB code ==========
Option Explicit

Public Sub Main()

On Error GoTo ErrHandler

    'Establish a communication channel with QuickBooks

    'Create the session manager object, and initiate a conversation
with QuickBooks
    Dim sessionManager As New QBFC2_1Lib.QBSessionManager
    sessionManager.OpenConnection " ", "QBFC Developer's Guide"
    sessionManager.BeginSession "", omDontCare
    

    'Build a set of requests - in this case, containing only one
request

    'Create the request set (the message set request object)
    Dim requestSet As QBFC2_1Lib.IMsgSetRequest
    'Create a qbXML version 2.1 message
    Set requestSet = sessionManager.CreateMsgSetRequest(2, 1)

    'Add a request to the request set.
    Dim customerAdd As QBFC2_1Lib.ICustomerAdd
    'AppendCustomerAddRq is called only once here, even though two
values are being set.
    Set customerAdd = requestSet.AppendCustomerAddRq
    customerAdd.Name.SetValue "Joe"
    customerAdd.CustomerTypeRef.FullName.SetValue "East Coast"

    'Indicate that all requests should be processed, even if one has
an error
    requestSet.Attributes.OnError = roeContinue


    'Send the request set to QuickBooks

    Dim responseSet As QBFC2_1Lib.IMsgSetResponse
    Set responseSet = sessionManager.DoRequests(requestSet)