$form['wrapper']['right']['packaging_wrapper']['no_contacts_flag'] = [
'#title' => t('Connector required to deliver', [], ['context' => DEFAULT_COMMON_T_OTHER]),
'#type' => 'radios',
'#attributes' => [
  'class' => ['inline-radios'],
],
'#prefix' => '<div id="pkgcontainer">',
'#suffix' => '</div>',
'#options' => [
  'with_contacts' => t('With Contacts', [], ['context' => DEFAULT_COMMON_T_OTHER]),
  'without_contacts' => t('Without Contacts', [], ['context' => DEFAULT_COMMON_T_OTHER]),
],
'#default_value' => 'without_contacts',
'#ajax' => [
  'event' => 'change',
  'callback' => 'load_default_callback',
  'effect' => 'fade',
],
'#required' => TRUE,