Banneton for Batard

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My oval banneton measures 9" x 6" x 2.5", which is fine for a 500g loaf.  I want to get a slightly larger oval banneton that would be suitable for a loaf in the range of 750-850g.  Do any of you use a banneton that might work for this amount of dough?  Please let me know enough details (manufacturer, dimensions, where you bought it, etc.) so that I can track it down on the Internet.  Thanks in advance.