If you're talking about the blue and black wire, any 14 or 16 gage stranded wire will work. If you're talking about the high voltage lead (spark plug wire) then look for a metal conductor core wire, preferably copper and make it as long as you need it.
Most ignition wire sold in auto parts stores today is resistance wire. Look for a motorcycle or lawnmower shop for metallic core spark plug wire, usually sold by the foot.
Tom