Today I changed my shifter bushings with a full replacement kit from Mercedes Benz
The white crescent shaped piece in the picture should actually be 1/2 of a 2 piece "circular" bushing for the shift rod. As you can see, not much of it was left after 50 years ! The balance of the bushings disintegrated as i removed them. Much better now especially with the help of this forum.
Many thanks to all who make this possible.