Victor Bullet Brake Question

[Dave D]

I have a reproduction bullet brake that was shipped to me from Ron Sitko for a friend in Canada. I want to plate some screws for him, but I am unsure of the size required.

Judging from the sizes of the holes in the one-piece base, two different sizes were used. Would someone be so kind as to confirm that I need both #6 and #4 screws to do this correctly?

Thanks so much in advance.
Dave