Should fit most of the calipers out there in the VAG family (VW, Audi, Skoda, etc). It fits a ½ inch shaft.
The images only shows a version with 3 pins but there is an additional pin added to support older versions of pistons as well.
Print with a stronger material like PETG, ABS or like me, a special reinforced version of PLA.
You need 4 M5 nuts to embed inside the model and 2 - 4 screws for the pins. I made the holes a little smaller to make them “lock” the screws in place if you use a length that is a little to long.
See images for use-case.
The author marked this model as their own original creation.