Automatically adjust selector lever or re bushing?

Moin, moin!

I'm so senile that I don't know if I posted something like that just a year ago. If so, then at least without success. So, a new attempt:

My 3.6 has the phenomenon since I bought it a year ago that the driving stages are not exactly where they belong, but shifted about half a gear. So "D" is between "N" and "D" and so on. So everything slipped up a little. Now this has shifted even further, which leads to the fact that I can no longer insert "P" because the backdrop is over.
Question: Can this be adjusted? I read in a Mercedes forum that all old SL would have this problem. The reason for this is the so-called plastic shift-bars, which dissolve in the course in good pleasure.
Can that be the problem with me? Didn't find a part like that at ETKA.
It's hard to change, and it's hard to change. to solve the problem as such?

Welcome

Tobi