Darrin, by "o-rings" do you mean float bowl gaskets? Western Hills Honda probably has what you need.
Digger's right, the 500T carbs are very similar to the DOHC450 carbs.,(maybe some difference in the jets) I believe the biggest difference is the 500T has Air cut off valves, mine had cracks in the diaphragms, so I plugged them. The air cut off valves do nothing but prevent backfire on deceleration. If the carbs are set right, you don't get much backfire., (How the 450 got along just fine for many years without air cut off valves is a mystery only the EPA has the answer for.)
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