Nilfisk and Tellus GS90 and GM90 and the G90 Allergyvac and Contractor vacuum cleaner clips set of two. They fit at the front and back of the container, and the kit also contains the screws and washers to make installation easy. They're also for the Mini Merc Vac.
As it's light, maximise the saving on postage and buy some of the related parts below, such as dustbags and maybe several Puregiene toilet rolls a box of Tissues and some soap or some other accessories!
At the moment, standard postage within Australia is capped at a maximum of $20!