You just need an EMT connector and locknut (and to make sure that there's no paint in the way)
You don't need the extra work of a grounding bushing for voltages under 250V, even when concentric or eccentric KOs are present, provided you're not dealing with service entrance wiring. This is implied by the lack of a specific bonding requirement for such circumstances in NEC 250.97, and is spelled out in section 4.7.6 of NECA-NEIS 101, the Standard for Installing Steel Conduits (RMC, IMC, EMT) (parts not relevant to conduit-to-box bonding omitted):
Metal raceways for feeder and branch circuits operating at less than 250 volts to ground shall be bonded to the box or cabinet. Do one or more of the following:
• Use listed fittings.
• For steel RMC or IMC, use two locknuts one inside and one outside of boxes and cabinets.
• Use fittings, such as EMT connectors, with shoulders that seat firmly against the box or cabinet, with one locknut on the inside of boxes and cabinets.
NOTE: Remove paint in locknut areas to assure a continuous ground path. Repaint or cover any exposed area after installation is completed.