I just need this specific GoPro mount to install it on my chest.

The working principle of this model is the same as that of the original bracket, but be careful, the printed parts may break. I printed my bracket with PBT-GF, which is a strong and semi-flexible material. Another material I recommend is PA-CF. I also tried printing it with PLA, and it didn't break, but just in case it suddenly breaks, be sure to secure your action camera with a rope.

You need the original GoPro bolts and nuts.