Automotive Better search management

I need wordpress custom theme upgrade or a Plugin as following: My website is using the theme: [login to view URL] The Manufacturer is not working the way i want it, you can test it in the above mentioned link, The requested function upgrade should do: 1- Allow adding car Manufacturers, car models and model start and end year in wp-admin panel and if the car production has not stopped yet, max value of year can be left blank. 2- when searching, the search function should filter the models and the year and only show the models to this manufacturer, and that also have listing in the website, then the year range should be as specified in the database previously. 3- The purpose of this filter is to show only pages with listings, i don't want to show any empty pages in case those pages does not have listings, and to add better control for my client on the input. So who needs to do this job must know jQuery, ajax, Wordpress custom post types. work should be done on my website directly.