The parts you need are also used on General Motors cars. Maybe that helps.
Can a local Fiat dealer order Jeep parts by chance?
Fuel disconnects
Quick disconnect part numbers
The Napa part numbers for just o-rings *is:
Napa 730-5018 3/8 Viton individual o-rings
Napa 730-5017 5/16 Viton individual o-rings
*Remember to re-use your old spacer between the 2 new o-rings!!
Napa CRB 212305 fuel line repair kit 5/16
Dorman 800-750 trans line repair kit 3/8
Mopar repair kits:
83502745 fuel line repair kit 5/16
83504447 fuel line/Trans line repair kit 3/8