This filter set is no longer made, you will need to buy the filter set with the granulated secondary  filter. That part number is SF9G-1 or RF9G-1.

Made for Riccar Radiance
Includes HEPA filter, Charcoal Filter, and Motor Filter

Suitable for: Riccar RAD Series that DO NOT use the HEPA Plus System

Contains one Genuine Riccar RF9 HEPA filter, one small direct air motor cover filter and one activated charcoal filter designed to absorb odors before they are exhausted into the air in your home.
Measures: Hepa Cassette Filter is 2 1/2 x 7 1/8 inches measured on the inside (outside is 2 7/8 x 7 1/2). Charcoal filter is 2 7/8 x 8 5/8 inches. Micro filter is 1 1/4 x 2 5/8 inches.

also fits Simplicity Synergy Series X9

Sku 8153