Looking for the thread pitch

Fitting an alloy bellhousing to suit a redtop to a type 9

No bolts, look m10 fine. Does anyone know the correct thread pitch?

Standard thread pitch as I remember, the thread is in the gearbox not the bellhousing

seem to remember m10 but finer than normal

M12x1.5x30mm 8.8 with spring washers for standard bolts.
They're a bit non standard, you will probably need to cut down longer bolts to match.

Dave