Have added them to my business contacts.
I've only been using them for a couple of weeks but the fit is good and they are as good as OEM.
Disc Brush-16 Prolite 3 Lug. Fits Nilfisk Advance Adgressor 2820D, Condor 4030D, Convertamatic, SC6500.
Fits Nilfisk Advance 56505835
This part is listed as fitting the following models: