Thank you very much Chris!
The module you're rebuilding is a great thing that many people expect, I searched the Internet for more than 20 days a module that makes almost the same as yours but it is impossible to find!
In other words both Joomla, Magento, CsCart, ZenCart, and many more ...
The problem is just the final sorting by category, after sorting "make model year", and your module can almost do that!
Thank you again Nathan!