124 sunroof kit?

Dear listers,
While fixing the sunroof woes of my 124 I have encountered a problem. The front "horns" of the sunroof frame that connect to the rubber drain tubes have disintegrated. Is not there any MB repair kit for such an ocasion? It seems unreal that Mb in its infinite wisdom would not provide a cure for the potentially hazardous joint. Replacing the whole sunroof frame does not seem yummy. If somebody has fixed this kind of problem before, please help. Sincerely yours,
Corneliu