How do you traverse the DOM from within a widget, using jQuery?

I’m using jquery UI’s autocomplete widget. How do I get the current element’s sister tag? For example, I have 2 elements in question: One has a class “product_name” and the other has a class “qty”. I’m trying to get the element with a class of “qty”, under the parent div “form_field_wrapper” only.

<div class="col-sm-10 form_field_wrapper">
    <input class="form-control autocomplete_inventory product_name" name="product[]" type="text">
<label class="col-sm-2 col-form-label">Qty</label>
<div class="col-sm-10 form_field_wrapper">
    <input class="form-control qty" type="number" name="qty[]"  min="0">

In a normal situation, I would use this:

    var obj = $(this);

But since I’m trying to find the obj inside the autocomplete widget, trying to use $(this) gives an error.

Below I’ve got a working example of changing the value of an input field with the class of “qty” based on the user’s selection.

        source: javascript_array,
        select: function (event, ui) {
            var tag = ui.item.value;
            var sku_code = tag;

            var series = JSON.parse(sales_list); //external JSON file with information on current selection
            $(series).each(function(index, value){
                if(value.inventory_id == sku_code){
                    price = value.sales_price;
                    max_qty = value.qty;
                    $(".qty").attr("max", max_qty);

But, of course, this will change the value of ALL elements with the class of “qty”.

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