Bolt help

[brett84]

a bit of a random question.
does anyone know the size and length of the bolts which hold the roof/hoop in place? The big allen head ones?

two reasons

1 - I'm a retard and cannot find mine, took them off a few weeks ago and I seem to have every nut and bolt apart from those.

2 - they were rusty anyway so I want to get some nice stainless ones but I have no idea what size they are?

I'm guessing from memory M10 or M12 but no idea on legth? maybe one 1" or 1.5"?

thanks