Assembly Bolts

[4OfaKind]

Guys I am on the verge of assembling my chassis. What size bolts would I use for A-arms and coilover shocks? I am using a C4 rear with a custom A-arms up front that is why I don't have stock bolts for reference. Is there a standard size generally used or are they application specific?

I may have to go to my local auto parts store but I thought i would ask the pros first.

Thanks
Mal