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I am sorry if I gave the impression that I was unhappy with my interior. Everything fit like a glove and the quality was top-notch. I was only asking for installation advice.

The interior is varnished, installed and has been used extensively since my first post. I am very pleased with the final product.

Oh, and BTW the answer to my question is very simple: #10 ss screws (I used 5 on each side). Thanks protek!