Replacement gasket/seal for Regal Kitchen Pro K6743?

The gasket around the drive shaft in my otherwise-perfectly-functioning Regal Kitchen Pro K6743 just disintegrated. I understand that Regal has been out of the breadmaker business for quite some time. Has anyone been successful in finding alternative replacement parts? My local hardware guy pointed out that not just any gasket will do, as it needs to be safe for food and also heat tolerant. Any suggestions? I can't bear the thought of a working appliance going to the landfill just because of a 1-inch part.