oops, forgot the part numbers. As James has already mentioned, the parts book shows a little "seal ring" 001-997-7540 between the solenoid and the CSV. It looks like a little rubber o-ring, not a cork gasket. Then again, it IS a little drawing in a book, so I could be wrong. Your cork-like gasket might have been the result of a sealing hack.
The other "seal ring" is one that seals the CSV itself against the intake: 002-997-5245 replaced by 000-141-0721 replaced by 000-141-0821 (I'm including all numbers so you can ask your supplier to verify the most up-to-date part #)
Hope this helps!
WAQAS in Austin, Texas