Giant Vector seatpost bolt condundrum

richieclose
richieclose Posts: 12
edited June 2013 in Workshop
Disaster last weekend. On a rough descent, the rear bolt from my Giant Vector carbon seat post came off. I lost both the bolt and nut. Its the rear bolt in the pic
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I've gone to my LBS (I'm based in Ireland) and they are saying it'll be hard to get one of these. So first off - does anyone have one going cheap? :)

Outside of that, has anyone successfully replaced it with a non-Giant nut/bolt? Its basically an m6 40mm, but I think the problem is with the nut which needs to be curved on one side - but maybe a curved washer would do? Help needed!