that's a good question. i don't know if they have extensions....if so...you may want to ask the manufacturer of the hedders. they may be able to point you in the right direction. if not....just buy the same guage wires as the one on your o2....and cut it...leaving at least 3 inches to work w/ on the connector side. then solder in the extra length of wires you will need for it reach and heat shrink tube them. and make sure to guide them away from the hedders or anything else that could cut/damage the wire.