Adding dynamic content to end_lvl in Walker Class

I’m trying to add unique content to the end of each dropdown (sub-menu). I’ve managed to edit the end_lvl function of the walker class to add the div to the end of each sub-menu, but now I’m lost on the next step: creating a conditional statement based on the parent-menu-id to echo different content. Any thoughts/suggestions? This is what I have (and I know its obviously not working because I’m trying to use the item array but with menu-parent-id). Clearly I don’t quite understand this.

function start_lvl( &$output, $depth = 0, $args = array() ) {
    $indent = str_repeat("t", $depth);
    $output .= "n$indent<div class="sub-menu">n<ul>";
}

function end_lvl( &$output, $depth = 0, $item, $args = array() ) {
    $indent = str_repeat("t", $depth);

     if($item->menu-item-parent==37) {
        $afterMenuContent = "Content";
     }
    $output .= "$indent</ul>n<div class="after-menu">" . $afterMenuContent . "</div>n</div>";

}