Hardin Logs

[ASURFCAT]

I am replacing the gaskets for my Hardin (Logs)exhaust. I noticed that the washers were aluminum and in very poor shape. So, a couple questions:

1. Are they supposed to be aluminum to protect the manifold?
A. If yes, Will copper work just as well?
1a. If not copper, where the heck do I get Aluminum ones?

2. Or will standard washer work fine?

The more I think about this , the more I am thinking regular washers would apply even pressure to the manifold when tightened.......
Maybe the washers I took off were just low grade material and the previous owner just kept tightening them and the result was deformed washers...........

[Bartman39]

Think the alum washers are for sealing but also alum is a sacrificial metal... Copper may not work in your app...? Alum washers can be found at some hardware stores but most likely ordered from a reg nut/bolt place or a Marine dealer...?