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Genesis once bubbled...
that typically has Scubapro parts kits for sale at reasonable prices. Buy a few extras and vac-pack them to keep the air from degrading the O-rings....
Some kits on ebay are older versions. I think they will work, but they may not be the most current versions. For example, I got a Mk20 kit with the older (white) HP seat rather than the current black one.
Thanks for the link Oxyhacker.