You can find the standard or deluxe gasket which fits a variety of InSinkErator models. This mounting gasket also helps muffle the typical garbage disposal noise when in use along with preventing splash back of water and/or other small debris.
Danco 12014 Garbage Disposal Mounting Gasket, Black
Danco, Inc. 80794 Faucet Stem Packing, 3/32 in Dia X 36 in L, PTFE
DANCO 3/32 in. x 36 in. Valve Packing 80794 - The Home Depot
Graphite Washers, Gaskets & Bonnet Packing at
Graphite Washers, Gaskets & Bonnet Packing at
10 Pack Washers, Gaskets & Bonnet Packing at
Danco 0.09 Graphite Bonnet Packing in the Washers, Gaskets
Danco 36375W 3/32-Inch x 24-Inch Graphite Valve Stem Packing, 10
Danco Bonnet Packing 21/32 Od. X 13/32 Id. X 5/16 T Rubber
Danco 36375W 3/32-Inch x 24-Inch Graphite Valve Stem Packing, 10
Washers, Gaskets & Bonnet Packing at
Danco 42-Pack Assorted Rubber at
Washers, Gaskets & Bonnet Packing at