The 20' version of the Carefree of Colorado awning also has two springs, one on each end. When mine broke the first time I took it into a shop to have it replaced. The last time it happened I bought the Pioneer end cap upgrade kit. The upgrade kit eliminates the spring and turns the awning into a manual crank up awning. The upgrade kit was around $67 from Amazon, worked out to be cheaper then a replacement spring, and it's a whole lot easier to use.
If you look up your awning model on the internet you should be able to locate both a users and service manual that should have the information you need... complete with pictures and detailed instructions.