Are these washer tank screws or something else?

[Sedbld]

Digging up and cleaning original hardware for my project and came across what I thought was washer tank screws. But after cleaning a bit found that they have copper washers. So now I’m not sure if they are. They are approximately 7/8” long and little smaller than 1/2” washers. Anyone have any thoughts or seen these or am I one the right path? Thanks in advance

 

[RemCharger]

64 Dodge? They remind me of the grill screws.

 

[Fran Blacker]

They look like washer screws because of copper washers.

 

[Sedbld]

Haven’t had any earlier than 66 cars. I thought they were washer screws but don’t ever remember seeing the copper washers on them. All repros have steel even from AMK

 

[jimbosride]