I found a Hillman #883772 O-ring for the cb77 carb spacer: 28mm x 33 x 2.5mm.
My old o-rings are very flat— good thing the spacers are too!
The carb-flange o-ring was replaced with a Hillman #883773 O-ring: 30 x 35 x 2.5mm
cb77 carb spacer o-ring
cb77 carb spacer o-ring'62 CB77, '76 XT500
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