QR seat post clamp advice needed

I need to get hold of a 29.8mm seat clamp for an On One 456 frame, but can’t seem to find any, seems that they’ve all sold out! Can anyone recommend where I can get one at this size?

The alternative is to get a slightly larger one, although I’m not too sure if this will fit or get one that isn’t QR. Advice greatly appreciated.

C

Or try a slightly smaller one. A non qr one will quickly get tiresome if you like to enjoy your descents.

any 30.0 one will work if you put 2 layers of electrical tape on the frame first (just like i had to on my cotic). salsa would be the ideal, but i think hope are making one for 2009