63-66 idler arm conversion to late model thru bolt ?

66fs said
Why? Plenty strong as is. Have put 500K miles on those cars, 64 66 and 67. Idler has never been a problem. 140 mph and all

If the one little ear was strong enough... there had to be some reason for changing it. There were daily drivers parallel parking and bumping curbs every day. If that little ear bends, toe setting changes.