This is a part for a MK2, MK2S, and MK2.5 Prusa printer. It allows you to install the Y belt easier like on a MK3. I combined the belt holder teeth from the MK3, shortened it to proper length, and added it to the MK2 style mount. Original models downloaded from Prusa directly. I've tested this on my MK2 and MK2s and it works great.
The author hasn't provided the model origin yet.