There apparently in the past were multiple entry points to the site. Some, most, or all of them may have been eliminated over the course of site revamps/redesigns. I had a non-standard URL bookmarked for years that entered to a page with a different search interface. It quit working several years ago.
My last successful order there was at end of Aug 2018. An order in early Sept 2018 immediately went on backorder. I received a weekly email advising of "temporary delay" until I canceled the order after 15 weeks.
We carry millions of appliance parts, snow blower, lawn & garden replacement parts, water filters and more. No matter where you bought it, Sears Parts Direct has the right parts.