def METHOD_NAME(extra_vars=None):
    """Extra easyconfig parameters specific to Tarball."""
    extra_vars = ExtensionEasyBlock.METHOD_NAME(extra_vars=extra_vars)
    extra_vars.update({
        'install_type': [None, "Defaults to extract tarball into clean directory. Options: 'merge' merges tarball "
                         "to existing directory, 'subdir' extracts tarball into its own sub-directory", CUSTOM],
        'preinstall_cmd': [None, "Command to execute before installation", CUSTOM],
    })
    return extra_vars