I am a bit confused here myself. Are we talking about the bolt that holds the clutch onto the end of the shaft?  I have one that is imperial and one that is metric.
I>{

Ah, your question explains David's response. My fault completely, sorry. No, I was talking about the 4 bolts which hold the torque converter on the engine.

All the explanatory videos on YouTube just tell you to use the bolts that you already have with your engine, but I am not sure that clones ever come with the bolts; mine certainly didn't.

(sorry for the confusion my question created)