This one is only one size. a 2×2. It’s a double door that opens outwards like the gates. These place towards you, unless you rotate.
This is a modlet and does not require a world restart. Simply place into Mods folder and play!
Tested and works with Alpha 19.4 b3
Recommended to be played single player or multiplayer. Works fine on servers as well.
The forum topic of the mod is here.