I'm on the hunt for replacement rear caliper adapters for my 89 J body. Over the years the ears of the pads have chewed into them and nothing slides at all anymore. I located one for the passenger side but my driver side is still buggered.
The part number(s) I'm looking for are 4383 535 (casting no.121708-02) or 4423 585 (this is the later ABS version - don't care as I can just plug the sensor hole)