$(document).on('click', 'a[rel^=lightbox], area[rel^=lightbox], a[data-lightbox], area[data-lightbox]', function(event) {
    self.start($(event.currentTarget));
    event.preventDefault();
});

$(".catalog-content a[data-lightbox='test']").first().trigger('click');

$(document).ready(function() {
    $(".cars-container a[rel!='']").click(function() {
        var rel = $(this).attr("rel");
        $(".cars-container a[data-lightbox='" + rel + "']:first").trigger('click');
    });
});

<div class="cars-container catalog-content">

$(".myClass").trigger("click");

<a href="http://..." data-lightbox="350xi" id="test">
    something
</a>

$("a[data-lightbox='350xi']").first().trigger("click");