I am trying to replicate the widget FilteredSelectMultipleused by admin for django applications. But my widget is very different

The widget in the admin using django-suit or django_admin_bootstrapped is executed using the bootstrap:

I define my widget and form carriers .py:
class ProcFTPForm(forms.ModelForm):
id_archivo = forms.ModelMultipleChoiceField(queryset=Archivo_Descarga.objects.all(),required=True,widget=FilteredSelectMultiple("Archivo",is_stacked=False))
class Media:
css = {'all':('/admin/css/widgets.css',),}
js = ('/admin/jquery.js','/admin/jsi18n/')
def __init__(self, *args, **kwargs):
super(ProcFTPForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
class Meta:
model = Lista_Archivos
And in the template, I call the media as follows:
{{ form.media }}
How can I render a widget FilteredSelectMultiplesimilar to admin widgets. In other words, how can I render this widget using bootstrap .
I am using django-crispy-forms , and other widgets are displayed using bootstrap other than the widgetFilteredSelectMultiple
Any advice
Thanks in advance