I purchased a set of these off the forum and am getting ready to install them. Does anyone know what the numbers written on them mean?

The fronts say 101 at the top.
The rears say 121 at the top and 106 at the bottom.
Also, does driver/ passenger side matter when installing the fronts. I assume it will for the rears b/c of the tab for the break lines.


The fronts say 101 at the top.
The rears say 121 at the top and 106 at the bottom.
Also, does driver/ passenger side matter when installing the fronts. I assume it will for the rears b/c of the tab for the break lines.
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