I had plenty of space on the adjustment, Do you think a 4in od will work? https://www.surpluscenter.com/Power-Transmission/Pulleys/Idler-Pulleys/4-OD-1-2-Bore-A-Belt-Solid-Steel-Idler-Pulley-1-3746-A.axd
i measured the belt its .4030in/10.24mm wide so I believe this is an A size belt. Please...