Nilfisk and Tellus GA70 and the Nilfisk and Tellus GM80 vacuum cleaner clip set of two for the top (filter) container, complete with copper filter bracket and 4mm screws. They secure to motor top on to the container.
Lots of times, if these seem loose, it's because the clips have been hit hard to make them grip better, but that just depresses the clip into a dent at the top, further opening them out, loosening their grip still further!
Simply, remove the catches by unscrewing them from the inside and "panel beat" the dent back out with a mallet, using the heal of your hand as a dolly on the outside. Screw back on the clips and probably all will be well!!
At the moment, standard postage is capped at a maximum of $25 within Australia, so maximise the saving on postage and buy something in the related parts below!