These mounts allow the Dayton Audio TT25 transducer (bass shakers) to be mounted to the Fanatec CSL pedals. There is a separate model for the accelerator and brake pedal.
The mount is secured to the TT25 via M3x15 bolts and then the entire unit is mounted to the pedals via a friction fit along with M5 bolts. You can also use some gaffer tape to help with securing the mount to the pedals.
Hardware requirements:
3 - M3x15 bolts
4 - M5x10 bolts
The author hasn't provided the model origin yet.