65 Barracuda inner door sill plates riveted or screwed?

Hey guys,

I have a question concerning the inner door sill plates of a '65 Barracuda. My fish had only one inner door sill plate when I bought it. Now I could get another pair and this brings me to my question.

The one plate I have is riveted, but a friend of mine has a '66 Barracuda with a screwed inner door sill plate - see the pics below.

My '65 fish:




The '66 fish:





So how where they originally mounted in '65?


Thanks in advance!