Aftermarket tank. Petcock issue

[TltedJelli]

Bought a bobber pacifica tank on amazon.the original tank has 2 fuel lines coming out of it going to the carburetor. What are they, more specifically, what's the smaller line. Does anyone know what kind of smaller aftermarket tank might fit the specs. I can't find the specs anywhere. It's seems like I'm in a deadzone with the 2006 as far as owners manuals. This is my second set of parts I have to return after everything originally looked okay specs wise.