I've got a Haynes book, but I don't see where it states how to replace those seals.
Other then, when the whole rocker assembly is off, replace them.
I'm not going to remove all of that right now to fix the leak, I'll just keep adding oil. Maybe when it's due for a timing belt.
If I could just get the seal out, and installed without doing all of that, I would. But I'd hate to have to mangle it out, and then have a hard time getting the new one in.
The one that I can tell is leaking, is the one opposite the cam pulley.