From a logical prospective, there is no fluid in this shaft housing just the moly paste and the universal joint and it obviously should be kept dry and dust free from road dirt and rain so I would think you could reuse the seal, gasket or whatever you call it. But the drive I purchased has a black hard gasket on it and that's it. The diagram sort of references a 2 part gasket which is confusing me. With all the discussion and minutia discussed with this installation I'm surprised this hasn't been discussed before. Seems to have been glossed over. Hate to beat this like a dead horse but maybe I'm making more of a deal out of it than necessary.
2003 Suzuki Volusia 800 Anniversary Edition