PowerPoint 2007 SlideMaster References to Rectangle 4,5,6

I have VBA code that resides in Project 2003 that calls to the SlideMaster in PP and modifies the (3) default rectanges in the footer. When I converted to Office 2007, I get an error message that "Rectangle 4" (same error for Rectangle 5 & 6) is not in the Shapes collection. I want to continue to modify the SlideMaster as part of the macro and need the 'new' shape names for these rectangles. Any suggestions?

Thanks in advance!