So far I haven't found such a list on the internet yet, but I know that www.designsbystephene.com
always lists the style number with every style. Just click on the desired jeans and you'll learn the correct style number for this style.
I've made a list of all these styles a while ago. It's an Excel file, so if you would like to have it just send me your email address (in a private message, please). You may as well publish the codes here in this thread if you like.
Best regards, Bianca