Currently replacing the front discs on a nc35 noticed they have a direction arrow the nc30 discs i am replacing them with don't other than letters question is are these directional also ? I have another set of nc30 discs lettering differs on both sets does the two stamped letters on each disc signify side to be fitted to the wheel right/left ?

Do not know what the difference is between NC35 left and right discs, only that they have different part numbers. NC30 discs are same part number for left and right.