Help setting up a buy option in the bulk item exchange

I'm trying to set up an exchange where I'm offering 5c for 1 gilded metamorph scarab on the trade website. If I understand the guides correctly I should be setting my premium stash to public, put in the chaos that I want to trade with and click on the option each item individually priced (since there's no scarabs in the drop down menu when you set the option to all the same price). This works fine when I'm trying to buy gilded abyss or breach or whatever, and I see my listing on the trade website. The tab is then called ~price 1/5 gilded-abyss-scarab for instance. However, the gilded metamorph scarab item tag is too long to fit in my stash tab name for some reason. How can I set this up or what am I doing wrong?

I would like to know this as well.