String! String! String is overrated. Joking. I didnt have string and used copper wire and it worked wonderfully. I was running clubmans and one line from MC to caliper and needed a custom length. However, if you are lacking string, copper wire, or something else that can be used for measuring, you can always order from z1enterprise. They will sell the appropriate length for your year and model. I, however, measured and mixed and matched as needed. It worked out great. Good Luck!
Frank