So I have a 1998 M3 Sedan with the non powered sport seats. The passenger seat has a lot of back and forth rocking type motion in it. I realize this is an issue with these seats. It looks like there are some delrin bushings you can get to fix this, but:

1: They seem like they are only for the Z3

2: It seems like that fix is for powered seats VS non powered sport seats like these.

3: I had heard there was a TSB that addresses this. Can you point me to it?

Has anyone resolved this issue on the E36 M3 non powered sport seats?

Thanks in advance
DS