Replacement impeller O-ring Cascade canister?

[BassetsForBrown]

I have either the cascade 1000, or 1200. I'm not sure, and the designers didn't think it was necessary to engrave or label it.
O-rings are cheap so I want to just order one of each, but I literally can't find anywhere online that sells them. Any ideas?

It's the o-ring that goes around the piece below the impeller, NOT the gasket that seals the entire motor to the base.

Thanks.

 

[Yuki Rihwa]

Home Depot or other hardware store, radio shark or a airshop store, don't forget to bring your old O-Ring with you for exact size.