fuel injector o rings on 2001 Ford E-350

i would like to know the size of the o rings on my e350 van 5.4 liter the measurements i get are 5/16 id x 9/16 od--- please help i want to buy these from mcmaster carr

Asked by for the 2001 Ford E-350
any parts store carries the o rings. you go by application, not measurements.