Frame bolts there are eight of these these ones are coated in gold zinc. The reinforcement plates are finished in bare metal. We have coated ours in paint grip which is a clear flat coating and will prolong rusting. The washers are glued(contact cement as per factory) to the rubbers to inshore correct alignment on assembly.
Two more of these secure the radiator support and are no different to frame bolts. They do have a nut which can be seen in photo they are square. I have seen these in gold zinc and silver zinc this Sydney built car had gold zinc.