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Possible re-install of "Stock by Attributes" mod for Zen cart and then additional mod to display stock numbers per attribute.
Front end shows:
Widgits (5 in stock)
Green Widgits (1 in stock)
Red Widgits (2 in stock)
Blue Widgits (0 in stock)
Black Widgits (2 in stock)
Stock levels automatically update with every purchase as well as adjustments through Admin.
This was working at one stage but now is not.