Thank you for taking the time to answer my question. I had a feeling that I would not be able to use this version with the most up to date version of Zen Cart(1.3.7). The way it is listed in the downloads section of this site led me to believe that it had been updated recently, Aug. 31, 2007. The only reason for using this module instead of yours is that I need to be able to stock by only one of the numerous attributes I have for many of my products. Is there a way to do that with your version?

Thank you again,

Colleen