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.
34 Inch cylindrical prolene polypropylene scrub brush. Fits Nilfisk Advance Adgressor 3220C, Hydro Retriever 2800, SC750, SC750ST, SC800, SC800ST, SC900ST, SC901
Fits Nilfisk Advance 56407475 Poly Brush (alt # 56407475)This part is listed as fitting the following models: