Black weather strip molding

Does anyone know where we can get the black weather strip molding? It fits between roof and side of trailer. By the color plastic..Guess it flew off the trailer when previous owners had T@B. On our x-T@B we were driving down I-40 and saw this strip fly off. Many miles til turn around. Lucky to have seen when flew off and it was still beside I-40. Now looking for another strip for our new/used T@B. Thanks in advance.