Here's What Behringer say:
EURORACK EARS (70 HP)
The Behringer EURORACK EARS (70 HP) is a pair of mounting brackets that allow Behringer synthesizers and other 3U format equipment to fit in all 70 HP EURORACK chassis.
- 19" rack ears for 70 HP Eurorack chassis
- Ideal for Behringer synthesizers and other 3U format equipment
- 3-Year Warranty Program*
- Designed and engineered in the U.K.