Here you go you Uncle Vin

I used this hardware from McMaster/Carr
The external tooth 7/16" washers are perfect match to original.
https://www.mcmaster.com/mv152160138...alog/91114A032

And these 7/16-20 NF nuts are really nice.
They might be stainless, but you can't tell with the black finish, and they have held up great.
https://www.mcmaster.com/mv152160138...alog/97149A240