The item ID for Iron Stairs, Railing Left is scrapIronStairsFilledRailingLeft
This is the GiveSelf spawn command to give yourself Iron Stairs, Railing Left 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, *).