U.S. Plywood Bi-Fold Doors

Thanks for posting! Your Plywood bifold bottom pins remind me of the 21-001 Bi-fold Door Pivot Assembly. The pin at the top, used with the spring, appears to be the 21-065 Bifold Door Top Pivot and Guide Pin, made by Fenestra. You may also need the 21-005 Bifold Door Pin for the pin in your second photo.

Each of the pins you have in your photos look like they use an older style of the 21-154 Pivot Rod Clamp. These should work well in place of the one you have.

Take a look over the dimensions below and compare them to your pins to confirm that these are the correct replacements. I've also tagged a few of the other pieces of compatible hardware below for you review.

Dimensions for 21-065

Dimensions for 21-154