Unicolor drum leak

I just purchased a Unicolor print drum for processing 4x5 film. Although the drum is virtually new (still with the original paper wrapped around the drum), the gasket that seals the top to the drum leaks. It appears to be slightly deformed and doesn't seat properly.

I wonder if gaskets are still available? If not, has anyone else encountered this problem and solved it with a commercially available gasket?

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