Firewall Question
 

On the my 70 c10 on the right side just under the cowl on the firewall, is the hole. The cab was bare of everything when I got it, so what should go here? It was a non a/c truck.
I can't think of anything under the dash that would bolt these, so I guess fill with a solid grommet.

Thanks

Re: Firewall Question
 

Hard to tell from your picture but maybe the radio antenna?

Re: Firewall Question
 

It looks like the hole where the grommet goes that holds one side of the fresh air vent in place. That would be for air conditioning cabs.

Re: Firewall Question
 

It's not for the antenna cable.
I forgot this was and a/c cab, it could well be that grommet.

Thanks