2 Door Gravity Pivot Cafe Door Hinge Assembly

found the doors in the back and wanted to put them back up but i cant find all the parts

We are renovating a home built in 1914 and we are looking for refurbished swinging saloon door hardware from that era that matches the existing hinges, which are not in good shape or good working order. i have attached the original hardware. the only marking i have been able to find on it is "CSB CO ... (cont.)

Why is the top piece that attached to the doorway plastic instead of brass? My other hardware on my old saloon doors has a top brass piece and not plastic. It looks a lot nicer especially when its on the top where people will most likely see it.

What is the diameter of the rotating pin used for the top pivot?

I am looking for gravity pivot hinges to use with full size 80" doors that are 15" wide and 1 3/8" thick. I don't have a ton of wiggle room under the door or above it if I add it all together. How much space would be needed floor to door and top of jamb to door for the 32-064 hinges to fit and fun ... (cont.)