Contax 159 MM Focusing Screens



I have just purchased a 159MM with a 50 1.4 and a TLA 20 flash - getting back into serious photography after a few years of using only a T2. The camera is in great shape except the focusing screen is marked fairly badly. I would like to replace it with a standard screen in better shape. Anyone know where I could find one? There was another post on this I realize but it looks to be about a year old.