Clois,
It is not considered a good idea to use any copper lines for fuel or brake in the United States.
May I suggest 3/16" Stainless Steel. It is expensive but it will not feel the effects of age like traditional steel.
There is a place in MI, 'Inline Tube' that sells great quantities of this.
I used 3/16 for both front and rear.
I Hope this helps.
