Backported Concrete Stairs & Slabs

Backported Concrete Stairs & Slabs is an extremely simple and lightweight mod that takes the Concrete Stairs and Concrete Slabs added in the 26.3 Wilderness Bound update and ports it to earlier versions. This mod aims to support as many versions as possible so you can enjoy these new features regardless of what version of Minecraft you play.

Version Support

As said in the first description, Backported Concrete Stairs & Slabs will try to support as many versions as possible. These versions will start closer to 26.3, and will work their way down toward legacy versions such as 1.12.2 or 1.8.9.  (Versions below 1.12 may need to also add regular concrete as a backported feature for support.)
Right now, Backported Concrete Stairs & Slabs supports Forge, NeoForge, Fabric and Quilt on many different Minecraft versions, with more to come soon.

What About Wool Stairs/Slabs?

Wool Stairs & Slabs are not added with this mod, however, I have created another mod called Backported Wool Stairs & Slabs which simply does the same thing and backports Wool Stairs to earlier versions. This mod works perfectly with Backported Concrete Stairs & Slabs.