Those rubber O rings are supposed to prevent oil running down the valve stems and puddling on top of the guides. If you choose to use some type of umbrella-style seal, DO NOT double up and use the O rings as well. It's possible to get too much of a seal and wear the guides out from lack of lubrication.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!