So after several people were disappointed that the 1999-2009 complete collection that came out here didn't include a plastic Bender head, they've decided to give us one. This set looks to be the same as the 19 disc US release from two years ago plus the two discs of Volume 5 ("Season 5" here) and some kind of pouch for the next two discs of 6ACV.
Did the US release have spare slots in the head?
https://www.jbhifionline.com.au/dvd/dvd-genres/comedy/futurama-seasons-1-5-boxset-21-disc-bender-head/656318