Are they just O-rings? As in, little circle of round-profile rubber in specific dimensions? 'Cause, in a previous life I had a lot of one-off fluid handling equipment to work with and was always able to find any O-ring I wanted at King Bearing (they are now known as Applied Industrial Supply ) - should be able to walk into one of their retail establishments with an old o-ring or any of the parts it fits, play the ol I'm just a hayseed who'll be outta your hair sooner if you help me out than if you don't character...

Unless it's not just a regular O-ring... <img src="/forums/images/graemlins/cheers.gif" alt="" />