Yugoslavia never fielded sidefolders. At the time all sidefolders were single strut affairs ( Egyptian, German, Polish, Romanian), and not stout enough for granade launching.
The triangle metal sidefolder, with U channel steel did not come out till the late 80s, IIRC. I saw AKS74U with them in service with police and MPs.
Information is correct.
The Iraqi's built the Tabuks on Serbian tooling, and they didn't have side folders either. Although the sniper variants did have a very comfortable and attractive skeleton wood stock.