Yep, that's what it says in my Bentley through the '89 models:
-Dana-

> A post to the list (1998) mentions the wear limit of the bushings:
>  * If bolt head or nut/washer comes in contact with supporting ring
>    (arrow), wear limit has been reached and bushing must be replaced.
> This info is not in my Bentley (1985-ish version) but may be in the newer
> ones. Can someone please check?
>

> Thanks,
> Martin (now in Edmonton Alberta)