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.
M8 Squeegee knob. Fits Viper AS430C, AS510B, AS530R, AS710R, Fang 18C, Fang 32T
Fits Nilfisk Advance VF81210 Knob (alt # vf81210)This part is listed as fitting the following models: