[Closed] Seatpost bolt - Where from?

Can anyone help me find a suitable replacement bolt for my FSA Gravity Gap seatpost? (Two bolt fore/aft design) It appears to be M4 and 40mm long, 4mm hex socket head, but not just a standard bolt head - it's curved to fit a dished washer to allow for the tilt of the clamp (picture below). What do I need to search for on fleabay? Or should I be looking elsewhere?

FSA say they have no spares... Seems mad to return an otherwise perfectly good post under warranty (presumably to be either binned and replaced or returned un-fixed if they somehow deem it to not be a warranty issue) because a bolt has snapped.

Thanks,

Chris.

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