Noticed the other day that vtec wasn't engaging. Checked oil and it was fine. 2 days later I checked again and was a bit low, looked around and noticed the solenoid was leaking oil.

Replacing the whole solenoid, but what gaskets do I need to order to replace it?

 

Just the spool valve screen gasket, the other gasket comes in the solenoid from the factory.

 

See this thread:
https://www.s2ki.com/s2000/topic/944...p-half-gasket/