Slant Six Manifold Flared Nuts

I don't think those nuts are the same. The stock ones are a cone shape. I will post a picture tomorrow. Not saying those won't work, they are just different.
I’m looking for the cone shaped. I have to bolt the manifolds up. I’m also looking for a radiator. I looked at the O’Reilly website, but couldn’t find 63. And ideas on radiators?