i japan they drive on the right hand side. because if this the mirrors are physically different to allow the correct reflection angles. when you put these on your car even if you adjust them to their extremes you will notice that you dont get the right viewing angle. this is because the jdm mirror that mounts on the left (our drivers side) of the car is cocked more inward than the usdm version. and the other side is turned more outward. Ive heared of alot of people switching the internals over to an integra mirror or similar in order for them to have the correct angles. I dont know the specifics of doing this however.