The OEM bolts have a nice shoulder that allows the belt to pivot around. I doubt you can find something similar at a local parts store or even HW store. 7/16 fine thread, yes. 7/16-20 with a shoulder, very doubtful.
This may or may not matter depending on what type of belts you're putting in.
I used the OEM bolts but I didn't like how loose the cables were, wanted to tighten them down some.