Cutting this one off an inch would be a lot easier than making one.
http://www.imperialsupplies.com/item/0707570

Imperial was bought out by WW Grainger a few years ago, and they took a lot of stuff out of the Grainger Book.

http://invest.grainger.com/phoenix.zhtml?c=76754&p=irol-newsArticle&ID=1341704