5-Window and Sedan windshield question

[Mel Chave]

I hope someone can help me here.
I need to make a bracket to locate the threaded stud onto my sedan opening windsheild after chopping the roof. The problem is, i have nothing to style it on as the original was cut off. The outer skin of the pillar has been removed (necessary for the chop) and i have whats left of the bracket after it was cut.
The only photo i have is this one of another sedan showing the assembly, it's possible to see the 3 rivets holding this bracket in place. Can someone tell me if the interior trim panel (the black vertical piece in the photo) has a cut out for this bracket? or describe how it all looks? From that i should be able to make something close if not the same as original.
Also, i have 2 slide washers and 2 knurled nuts from CWMoss is this the correct amount? or should there be 4 slide washers?
Thanks
Mel