Rear suspension bolt sizes?

[wheelman]

This is probably going to sound like a very strange question but here goes anyway, does anyone know the sizes of the bolts that hold the rear control arms to the subframe? Diameter and length.

I bought a non-hicas subframe from a local guy but none of the bolts used to attach the control arms were included. I can get grade 8 or even 12 bolts from the my local Fasten All store but I need to know the diameter and length before buying them.

Thanks