Inner fender seals

[KVB]

I have a 65 GMC, that I am in the process of putting the front clip back together.

Firewall is painted, the inner fenders and rad support as well.

I am pretty sure I do not want metal on metal.

I saw a product in my local Canadian tire store that looked alot like household weatherstriping.

It was in the autobody section, and was identified as automotive. It was a roll of 5/8'' black foam. says waterproof.

Anybody use something like this?

Any other suggestions as to what to use?

Thanks