Brass exhaust washers

It's called a conical washer. The parts guy may look at you like your a idiot when they won't/don't know what the definition of conical is. Good Luck

No, the end ones are not conical. The two end washers are brass and flat, with a bevel on the I.D. on one side for the special nut to fit inside of. Some of the other washers are conical, but not the two on the ends.