O-ring size for Fuel Pump fittings

[lr172]

EDIT: I finally found a part number for these at ACS.

I am re-using the fittings from my old fuel pump and need new o-rings. Does anyone know the proper size o-ring. I am getting a little bulging with the one that I tried and I am assuming I should get full contact between the fitting and the pump.

Thanks,

Larry