I just got my new slotted /drilled rotors from zzp and after I tossed the boxes I realized they don't have a right or left stamp on them. I'm assuming the pattern goes with the forward direction and not against but want to make sure

 

the shiny one goes on the left

 

The pattern goes forward for the correct side, yes.

 

It doesn't matter since the rotors aren't directionally vaned.