This is a replacement for the retention plate on a BlockDock 12HD or a BlockDock 10TC.
If you have a new BlockDock and you can't find it, BEFORE YOU BUY THIS look very carefully inside the slip cover. It is in the pocket.
Important Note:
These will not work on Bassliner or Frontliner products. These are only for metric BlockDock 12HD or BlockDock 10TC.