fuel line size KZ1000J

I am dumb and threw away my old cruddy fuel line in advance of measuring the line size. The bike is an 82 kz1000LTD with BS34's. I ordered some 1/4" line from Z1 with a fuel filter, and only now realized that they have another size, 3/8" (I think). What size is standard on these bikes? I looked it up in the manual and it doesnt say, it just says to change it at regular maintenance intervals.

measure od of your fitting coming off petcock ,same on carbs.your not gonna flow anymore fuel than those fittings will allow.

1/4 ID, or 3/8 OD sounds right, don't for get (spring) clamps regards Duke