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I don't know the exact size, but I'm assuming you found this:

Ibis Seat Binder ? Ibis Cycles Online Store

Even though you can't tell from the picture in the link, Ibis collars have a slight dip in middle to follow the seat tubes lines...and while you can use other seatpost collars, they won't sit flush and will look kinda wonky.

I think I have one or two extra kicking around in the nickel chrome if you want it for shipping. They're pretty beat though.

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