Berad

Hey guys, I'm new here but need help. I have a 2008 with 5.4 engine. I need to replace the O-rings where the main supply line attaches to the fuel rail. I have visited my dealer and they say I have to buy the entire fuel line in order to get the O-rings. Do you have any advice or maybe a part number for these parts? There are two o-rings a black one and a blue or green looking one. The dealer was supposed to order them for me and must have tossed them so i cant just go match them up. Thanks for your help.