Today a surprising discovery 1973 CB350F Keihin carb fuel rails use 4 orings per rail... precisely identical size in same application as your EX500 rail orings but...47 years ago? I found this quite interesting.
Very possible...double orings assure no leak, reliable. In view of the fact that these oldies are tricky and time consuming to fully split and service....long service life was desired and considered in design, no doubt. My pic only shows a small percentage of the multitude of attaching rack parts and throttle linkage hardware....def an old school design carbset.
I'll follow up with an "overview" pic of removed parts on the overcrowded work in process storage tray. Lotta stuff.
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