The item ID for Cobblestone Wedge Full Corner Top is cobblestoneWedgeTipCNRFullTop
This is the GiveSelf spawn command to give yourself Cobblestone Wedge Full Corner Top in 7 Days to Die.
Copy the command below and paste it into your 7 Days to Die game or server admin console to obtain. You can open the console by pressing usually one of these keys (F1, F2, *).