Go Wing trunk support bracket question

Need some help on whats needed to complete this. I have this picture I took(from the garlits car show, not my car) which helps me know I am still missing pieces to complete this. Do the screws thread into some type of adjusting nut at the bracket? And if so does anybody have or know where I can get them. I have the black brackets, thanks for those Motopsycho.

Thanks.