Shoot! You ought to be able to local source a bushing like that.
My wife's uncle passed away and I got his old (orange) Skil brand circular saw. Started whining real bad. Took it apart, removed the 4 (different) bronze bushings, and dumped them on the counter of a power tool repair place. Guy tossed a cardboard box FULL of bronze bushings on to the counter and said, "See if you can find what you need in here!" 5 minutes search and $8 later, I was walking out of the pace with 4 new bushings.
Word of advice, though. Soak any "new" bushings you get in turbine oil for 24 hours prior to installing them. They are sintered, meaning they have lots of microscopic pores in them. That's to hold oil, which drains out when they sit around awhile. You need to soak them to "reload" the pores with oil.