Those bushings are designed to be mated with an interference fit on the outside. They will also handle pretty serious motion and should last a LONG time on a rudder pintle. Ideally you should press them in using a mandrel to maintain the proper inside diameter but since a mandrel would be prohibitedly expensive, you can push them in and drill them to the proper inside diameter afterwards. Ideally, a machining 'reamer' should be used to achieve the proper inside diameter after installation but you do loose some of the lubrication qualities when you resurface a bronze bearing (most of these bushings are impregnated with a lubricant and proper surface porisity is important to the life of the bearing). They can be removed by drilling them out or pressing them back out later.

In all reality, this application is such a low load that a very low tech installation would be fine. You might even consider using epoxy to glue them in place if you have a loose fit - but I'm not sure how well it would adhere to the metals. You may want to etch a groove around the outside of the bronze bushing so the epoxy can really lock it in place.