Technical 1934 Ford - How do you attach hinges to repro trunk?

No holes are drilled, but what goes in the whole once drilled?

Rivet nuts?
Caged nuts?
Drilled and tapped plate?
What did Henry use?

Thanks,
Rich

 

Henry used 5/16 UNF round nuts electrically welded in behind the trunk inner. I think 33/34 and 35/36 hinge parts are the same.

 

Weld some plates on the back side and drill/tap them to match the hinge. 5/16 UNF sounds about right.

 

What MVee33 said.
Not a good pic, and enlarging didn't help, but I'm thinking that they were like D-nuts. Rivnuts would work well I would think.
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They were D nuts crimped in before the skin went on the outside. You will have to be more creative. 5/16 steel with threaded holes snuck in there some how and spot weld thru a 3rd hole in the center