We went a round or 3 of discussion in the past. Only the OEM engineers can explain why upper arms are so strange and not mirror imagine in left to right. This is the same engineering that put one rear wheel ahead of the other in those wheel wells.
I understand only that these factors are relative to a few things, weight displacement, torque thrust, and the crown in the road.
Bottom line... Don't be surprised if you get another arm only to find it identical to the one you have. Please let us know in any case. Good luck
