I guess I wouldnt replace the bottom rubber hoses with stainless steel hoses, and still keep the upper rubber hose from the master cylinder to the hard steel line. Any aftermarket extended hose will replace the whole run from the master cylinder to the brake calipars. Some use 2 lines all the way down from the master cylinder, while others run a single line down to a T that gets mounted on to the frame. Then each line runs out to the calipars from there.
Here is the 3 piece SpeedLineZ's
http://www.ebay.com/itm/SPEEDLINEZ-Yamaha-Banshee-3-Pc-Front-Brake-Lines-by-American-Star-/360542789698?pt=Motors_ATV_Parts_Accessories&hash=item53f2066042&vxp=mtr