Track

I have a Silverline M5500 patio slider (~ 6 ft). Recently, because of moisture within the thermopane glass, of the slider panel, Silverline has supplied an American Craftsman panel replacement which fits well. During the installation of the new panel, it was noticed that the bottom roller stainless steel track has an hairline crack which, the installer tells me, requires replacement. Would you have such roller track? If such track is not available, I could possibly place a cap on the top of the existing track, as a second option.
My understanding is that the American Craftsman series 50 is the equivalent of the Silverline M500.