Perhaps something like this:
Sub ScratchMacro()
'A basic Word macro coded by Greg Maxey
Dim oILS As InlineShape, oILSNew As InlineShape
Dim lngIndex As Long
Dim oRNg As Range
For lngIndex = ActiveDocument.Range.InlineShapes.Count To 1 Step -1
Set oILS = ActiveDocument.Range.InlineShapes(lngIndex)
If oILS.Height = 72 And oILS.Width = 96 Then
Set oRNg = oILS.Range
Set oILSNew = ActiveDocument.InlineShapes.AddPicture("D:\Test.png", False, True, oRNg)
With oILSNew
oILSNew.LockAspectRatio = oILS.LockAspectRatio
oILSNew.Width = oILS.Width
End With
oILS.Delete
End If
Next
lbl_Exit:
Exit Sub
End Sub