I don't think anyone makes a duplicate of the original "pierce-nut"; they were auto-fed into a punch press, which had a die set that pierced the hole, inserted the nut, and peened the corners to retain it in the panel in the stamping plant. We hated them in production - if you cross-threaded the bolt, it would spin the nut out of the hole, and you had to repair it with a loose hex nut.