Nilfisk and Electrolux Euroclean UZ934 Cubit and Terrier commercial vacuum cleaner front castor wheel kit. Consists of 2 castors along with the steel pins.
It's also for the Nilfisk VP300 HEPA
As it's light, maximise the saving on postage and buy some of the related parts below, such as dustbags and the filters or a new floor tool.
At the moment, standard postage within Australia is capped at a maximum of $20!