We always put in a new set of garage door tracks with our new doors. It all comes down to compatibility. An old pair of garage door tracks may not be compatible with a new panel or garage door system. Most tracks are fastened with a rivet that is only set to open and close at a distance from the side post that is set in the factory. While a few doors can be adjusted for different tracks, most cannot. The cost far outweighs the benefit, and the risk simply is not worth it.