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Most all the kingpin reamers I have bought over the past 50 some years have included a bushing driver; slightly less in OD than the the spindle bore with a stepped shoulder slightly smaller than the bushing ID.
Drives the old bushings out easily and drives the new ones in smoothly.
Usually drive the bottom bushing from the inside out and the top one from the outside in; easier to start the bushings square against a machined surface.