def METHOD_NAME(project_dir, element_name, alt_suffix=None):
    # Get whole filename in the temp project with
    # the option of changing the .bst suffix to something else
    #
    if alt_suffix:
        # Just in case...
        assert element_name.endswith(".bst")
        # Chop off the 'bst' in '.bst' and add the new suffix
        element_name = element_name[:-3]
        element_name = element_name + alt_suffix
    return os.path.join(project_dir, element_name)