The multibrackets that come with the Define 7 and 7 XL can be used to mount a 3.5" drive, 2.5" drive, or pump/radiators. The multibrackets can also be installed on almost any 120mm fan mount.
These multibrackets are also sold as an additional accessory (Universal Multibracket - Type A)
*Also applies to the Meshify 2 and 2 XL