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.
14 Inch disc dyna grit 80 abrasive brush for 28 inch machine. Fits Nilfisk Advance Adgressor 2820D, CMAX 28ST, Convertamatic 24-32, SC750, SC750ST, SC800, SC800ST, SC900ST, SC901
Fits Nilfisk Advance 56505802 80 Grit Brush (alt # 56505802)This part is listed as fitting the following models: