Parts for vintage dining chairs

Hi there,

I recently bought 4 vintage danish dining chairs. They're nice but missing some parts. I'm looking for about 14 steel pins supports (1 1/2" long) tubular shape with a hole for a screw. They're placed in a hole in the side of the frame to support the seat. Could you please tell me where I can find/buy this item.

Thanks in advance…

Noel