3/8th sender to 5/16 fuel line?

[5hunert]

I'm changing out the fuel sender on my '69 Charger 500, 440 car.  The original sender was 3/8ths, with a separate vapor fitting. However, the car came equipped with a 5/16 fuel line and the vapor line. Its the factory setup and still has all the original clamps.  The hose is deteriorated to the point that I can't tell if it was a 3/8th hose clamped down to the 5/16 line, or a 5/16 hose stretched to the 3/8 sending unit. 

Has anyone else encountered this?  What size hose did you end up using?

[Charger RT]

my 68 R/T was this way. I replaced the 5/16" line with a 3/8" line. It fit in the same frame rail clips.
Tim

[Cooter]

I Always upgrade to the 3/8" sender/pick up. However, many people will do only the sender and run leave the 5/16" line all the way to the carb.