Any question answered...

Ah yes, I know the type - the CBR1000F which Cycliste has in her Ginetta G20 has a similar long bolt, as does the Blackbird engine I've got. In that case, a length of 10mm studding should be fine - that's how both the engines above are attached. It's probably best to use high tensile studding, but this should do the trick. Then you'll just need a couple of M10 nylocs, one on either end.

Thanks!