Body-To-Frame Mounts on Crown Vic, G. Marquis & Town Car

Has anyone changed out their 12 rubber bushings that go in between the frame and the body on Ford's RWD Panther series?
I have yet to find any info on doing this with the exception of a tsb
that recommends shimming that space to specs when the rubber wears down.
It looks like it should be serviceable by replacement.
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