I've been looking for replacement nails for years and it finally occurred to me to ask for help!

I have a loose hinge on an antique cabinet and it is missing two types of fasteners.

The picture shows the type of hinge, and the lag pintle and the nail that I need.

The square nail is 1" long and has a flat 3/8" round head. I've seen longer nails that are similar but not this length. Does this style of nail have a name?

The lag pintle for the hinge is 2" long, and its round barrel is 5/8" long and 1/4" diameter. It appears to have been made from a bent square nail. I found similar lag pintels but they are threaded and are larger.

I can't find replacements so I wonder if these are custom hand-made by a forge. If replacements can't be find, can anyone recommend a forge that could make replacements?

Many thanks for whatever info can be provided.