CSL Button Box. You will need a Pro Micro board and you will either need to create a sketch for the buttons to work or you can use the sketch from AmStudios Youtube video. If you use his sketch please give him a like and sub as that sketch is all the hard work in this project. He has a lot of awesome DIY sim racing videos so check him out.

Link to video: https://www.youtube.com/watch?v=Z7Sc4MJ8RPM&t=168s

The parts and sketch are listed in the video information.

Work in progress: I made this one time for a friend of mine with this base. I own a different base so I was not able to test print it before shipping it to him. It fit perfect but he said there was a little flex when pressing the buttons. This was because I previously designed the back box as a square and so there was no support keeping it snug against the wheel base. I have since changed this and shaped the rear box area so that it would sit flush with the wheel.I have not tested this since making that change so if there is any issues please let me know. I'm going to actually print one and send it to him to see if it works. I will update this post when that happens.