Quote from Hondaman:
"The O-rings for the fuel tees are OEM size 1.9x7.9mm. The main thing I have found: if you can find them in Viton (no shrinkage with ethanol) then they are a struggle to assemble. You can find 2x8 O-rings in Buna everywhere, and if you touch some grease or oil to them, they will slip right in. When they shrink (5 years from now) they will shrink about 3%-7%, which will make them stock 1.9x7.9 size again. :-)"
