Great response to my questions from their customer service.
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Big Mouth Pad Retainer
Fits Clarke Ultra Speed Pro 1500 and Viper Fang 20 / 20T, Venom Vn1500, Fang 24T, Fang 26T, Fang 28T, AS5160
Fits Nilfisk Advance VF99003A (alt # vf99003a)This part is listed as fitting the following models: