any idea on how to find out the thread pattern? Is that what the 7x9.6mm is? dont bolts sizes come with a letter next to it?
The 7x9.6 refers to the size of saddle rails the clamps will fit.
The size bolt you need is M6x55. The thread pitch is 1.0mm which means it's a commonly available standard thread for that size.
I'd advise you to buy it from a reputable source because as you say there's just one bolt holding everything together.
I bought mine from Pro-Bolt. They use aircraft grade Ti and supply motorbike race teams.
Use carbon paste where clamps and the seatpost engage. That definitely helps with slippage.
Look has a Ti bolt in their EPost design (Epost Ti).
Holds up to 22nM which is quite a bit.
you should be fine
The torque spec for the M6 Ti I bought was just over 11Nm. The clamps have 12Nm stamped on them so care must be taken. Is the EPost an M8?