One of the advantages to the poly bushings is that they are not susceptible to damage from oil contamination. Pretty common for the PS pump to seep a little fluid over time which makes its way down to the rubber bushings and softens/degrades them.
You can rebuild the new bracket with fresh bushings (poly or rubber, whichever you choose) on the workbench then swap it on as GV said.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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