I know it’s an old topic but I haven’t found anywhere the exact answer as to whether replacement bushing fit this bracket. Yesterday I successfully solved the problem with tedgum bushings. Part numbers are 00603794 and 01160779.
For smaller bushing there is no metal part inside, so you must cut old bushing and use that part. After placing smaller tire in the bracket, to install the metal part I made pointed metal guide from an old car screw to spread the tire without damage. I used Vaseline for lubrication.