This is the plinth that the side brush mounts on. The brush simply clips on, no bolts are used with this arrangement the second photo is simply to illustrate how the part is situated on the broom.
It suits many of the Nilfisk fleet of mechanical floor sweepers, such as Nilfisk SW850P and the Nilfisk SW700S and the Nilfisk SR1000S and the Nilfisk-ALTO Floortec R550 floor sweeper and the Nilfisk-ALTO Floortec R360 and the Floortec R560 and the Floortec R670 rider floor sweepers as well as the Kent Blue 32 and the Terra 128B
Maximise the saving on postage and buy some of the related parts below, or some parts for your Nilfisk or ALTO vacuum cleaner, such as some dustbags, some clean filters, or a new floor tool and hose.
At the moment, standard postage within Australia is capped at a maximum of $20!