Fuel Resistance O ring

I had took my carburator a part for my Yamaha 1989 Radian YX600 and did a deep cleaning.

I need the fuel resistance O ring for the needle valve set. that the part where the needle sit in and the float on top of it.

Where can I get the fuel resistance O ring ?

check yamaha dealer but they only sell the needle valve set for $53.00 each.

I dont need the whole set just the O ring.

The size of the O ring is : 5/16 x 7/16 need four