I would stick those OEM bushings as mowers with bushing tends to eat up the spindle shafts when they start going bad requiring the spindle to be replaced too.
.76 ID (slightly over 3/4") 15/16 OD Wall thickness 5/64" Flange OD 1-15/64"
The closest is McMaster-Carr PN 2938T707. These are hi load 863 Iron-Copper Bearings or 6338K578 841 Bearing Bronze Bearings Note this also only rated for 60 rpm under heavy loads.
You may have to ream the ID out a little as these are 0.752" instead 0.760"
Thanks, Since the old ones were pretty badly damaged I really could not get a decent measuremt. I tighter fit on the shaft is desirable. That load rating has to be better than the plastic ones. The replacement ones are cheap enough but they will not last long. Some are 3D printed.
Due to the previous owner not paying attention the pivot arm axle needs to be replaced along with one axle assy. As you described is what happened and even worse. I found a used assy that I may buy but I want to replace the bearings with new so i do not have to do this again for a long time.
Have you actually use these Iron Copper Bearings from Mcmaster?
On the same machine the spindles are toast. I should probably start a new thread but wondering if the aftermarket spiindles with grease fittings are worth it. I have read they are not often assembled correclty by removing the inner seals on the ball bearings, therefore the grease never gets to where it needs to be.