I did get full value on the bearings though! In fact, there aren't any bearings left.
Where there is copper here, there should be babbitt, the actual bearing surface has worn away.
No need to replace parts until they are fully worn out!
This was pretty close to a catastrophic failure though.
I guess my truck isn't the One Horse Shay
http://www.eldritchpress.org/owh/shay.html