Zen Cart 1.5.0, Stock Monitoring with Multiple Attributes

I am selling clothing using Zen Cart version 1.5.0 (the current add-on is not compatible) and need to be able to have multiple sizes and color in a type of product and track the inventory according to size (eg. S,M,L,XL,XXL). Zen Cart currently does not have this option (it allows you to add sizes but doesn't allow you to track the inventory for each, but instead groups them all together into 1 inventory count). I would like this to also prevent customers from purchasing a certain size product if there isn't enough in inventory by showing 'Out of Stock' or not showing them any option on the OOS size & color. I also need the ability to change the status of a product if the item is out of stock. Only looking for people who have experience with Zen Cart please.