To fit my Motobecane with new cables and casing, I simply went to a local bike shop and bought six feet, or so, of nylon lined casing and the necessary teflon coated cables, both derailleur and brake. Make sure they include casing ends (usually sealed these days) and cable caps, or ends. Also, make sure you ask for mountain bike or road bike - there is a difference. The brake cables fitted in the picture are of mountain bike design.