eBay-ForPartsOnlyEnhancer.js

// ==UserScript==
// @name         eBay: [For Parts Only] Enhancer
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  This simple script tries to enhance what eBay did not do, what I think it was supposed to be done from the beginning.
// @author       0x90
// @match        http*://*.ebay.com/sch/*
// @grant        none
// @require      https://code.jquery.com/jquery-3.3.1.min.js
// ==/UserScript==

(function() {
    'use strict';

    var SecondaryText = $('.SECONDARY_INFO')
    var i;
    for (i = 0; i < SecondaryText.length; i++) {
        if(SecondaryText[i].innerText == "Parts Only")
        {
            SecondaryText[i].innerHTML = '<img src="http://icons.iconarchive.com/icons/emey87/trainee/16/Signal-attention-icon.png"/> <big style="color:red;"><b>FOR PARTS ONLY!/ NOT WORKING!</b> <img src="http://icons.iconarchive.com/icons/emey87/trainee/16/Signal-attention-icon.png"/></big>';
        }
}
})();