$arParametrsList['HEADER']['OPTIONS']['HEADER_TYPE']['LIST']['3_custom'] = array(
'IMG' => '/bitrix/images/'.$solution.'/themes/header/03.jpg',
'TITLE' => '3 custom',
'POSITION_BLOCK' => 'block',
'POSITION_TITLE' => 'left',
'IN_BLOCK' => 'Y',
'ADDITIONAL_OPTIONS' => array(
'HEADER_NARROW' => array(
...