M body torsion bar bushing

!988 Diplomat non police car.
Anyone have a source for new torsion bar to frame mounting bushing? Mopar list it as "pivot package, cushion spring". Part number 04186828. I have been unable to locate these.
Scheese, it is easier to get parts for my 1960's "A" bodies, then this Dippy. Want to keep it, as I bought it new, and only has 125,000 miles.
Author: Charrlie_S