Dynamically update options based on other choices on page -- 2

We are on X-cart 4.4.3 Gold, and have the Make/Model/Year and Refine Filters modules installed. We need these to communicate with each other while browsing a category page. You can see an example page here: [login to view URL] What we need to happen is, once a Make/Model/Year has been chosen and applied by the customer, we need the Refine Filters (on the left side of the page) to dynamically update the choices available to only match those which work with the MMY chosen. The reverse is already in place, where if a filter is chosen first the MMY drop downs only show available choices for that Filter.