Pantera East sells poly bushings that slide into the outer metal sleeve of the OEM bushing, so you don't have to remove it.
I used a reciprocating saw to carefully cut the OEM inner sleeves and then pull them out.
I drilled thru the metal of the A-arm and outer sleeve and then the bushing itself so grease from the Zerk would get to both inner and outer surfaces of the polyurethane.
I took my lower upright pivots apart and found them to be in good order, so I just greased them with synthetic grease and reassembled.
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