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mespilus
I think I've got the same BBB seatpost as @mespilus.
Or at least a model that uses the same size bolts.
I've also been looking for some replacement bolts as the current ones don't look that great...
Anyway, they really are some weird size that's not quite M5.
They are 5,2 - 5,3 mm in diameter and something like 0,68 - 0,69 pitch. Pictures below.
I guess these are proprietary bolts? Why would the manufacturer not use standard bolts?