Measure it end to end. We have good stock of Teleflex every length from 10-20 feet. Local so cal UPS delivery is normally one day, we can ship same day if you order in the AM. Just give a call if you need any help or assistance.
If you are taking out a Morse or Teleflex cable most all have the length stamped into the cable jacket either in inches (like a part number then 144 or 168 etc) or feet.