Check out QueXpress, I believe he has a method of installing the right side double roller in the left side, which should take care of all the left side failures.

Purchase a ride side bearing (#18 in the diagram) in order to replace the left side bearing (bearing# 17 + dust seal # 19 in the diagram).
With a micrometer, measure the difference between the left side bearing, and the right one.
Have a machinist reduce that measured difference from collar # 4.
You now have a smaller collar # 4 which will permit you to install the thicker bearing on the left side.
Don't worry about the dust seal. It's overkill.
Note: I didn't design this mod, but can say that it works very well.
