The bottom plate is for the Bulgarian/Russian Sidefolders and the top plate is for the Polish style underfoder. These are not needed on the Yugo's unless you aren't using the original pistol grip mounting plate.

This plate welds to the rear lower section of the receiver to strengthen that area when using folding stocks. As shown it is set-up for an underfolder. The bend is in the right spot and not touching the hole so there are not fitting issues.

These will need to be spot welded on the Receiver.

Please choose either Polish Under folder (Same as Hungarian models) or Sidefolding (Russian or Bulgarian models).

You do not need this piece if you are going to use the Tapco Folding Stock.